Did you guys tried to switch away from your Canon full frame gear for your travel photography to Olympus Micro Four Thirds?

quality does not depend on size of sensor, it depends first and foremost on the quality of the lens and its easier to correct lenses for smaller sensors, the sensor is almost an irrelevance. Pixel size defines native dynamic range certainly, but all sensors now have getting on for 14 stops; human vision is 10 stops, if you set correct exposure you dont need much provision for adjustment in post. A top of the range Canon full frame has great glass but it isnt that great. So yes it will be better than most mirrorless but not because of its sensor size, it has great intrinsic quality in its pro lenses but, not better than all. Its not going to provide you with the same quality that an APS leica will provide. I know that from personal experience comparing my Nikon D700 with my Leica X113; out at night I take the D700 but any other time the Leica blows it away. And really that is the key, if you could overcome your ego, yes I personally know we all like to have more impressive kit (points at my D700), if you travel with your OM-D with 12mm, 17mm 45mm and 75mm f1.8 primes you will find this kit blows your Canon and your Olympus zooms out of the water for most things and your travel kit will be about 1kg in total, it will fit in a bumbag add the standard zoom if you must. You will get plenty of shallow DoF with the 45 and 75; the sort of levels modern photographers demand is just pathetic, its just mindless fashion. Please avoid the f1.2 primes they are heavy clumsy and dead, they are for providing the shallow DoF demanded of by the weak minded but just dont pop; no lens with more than 10 elelents pops. The f1.8 primes are unmatched for quality and pop in MFT and they are compact and gorgeous; Nikon have nothing below full frame that comes close to them, my D7100 and 35mm f1.8 was a poor second. All I ask is suspend disbelief and go try the 17mm and 45mm f1.8 primes, my standard travel kit (both these lenses will take a 300% crop so I dont need a zoom), I didnt believe it either, not until i stuck the images next to my Nikon images, result I sold the Nikons and bought a used Leica and adapter for my Nikon glass, I fully believe in MFT now. Mostly I take a GX7 (soon to be a GX8 I hope) 17mm, 45mm and 14-140 zoom with an Olympus TG-3 Tough compact backup in my handbag; the proof of the pudding is my annual folders, last 30 years were Nikon, this year its MFT and Leica X113 & T and its the best folder yet. But what would I know, I am only a principal scientist with expertise in imaging systems who has been taking photos since 1956 so most people laugh at my advice, I just wave my tiny panasonic fitted with a 45mm prime set at x2 digital zoom at their huge Nikon rig and point out that I actually got a photo of the leopard hiding in the tree from knee height using my swivel touch screen and they didnt; all my camera bodies now have a touch screen.

I shot with a Nikon D7200 for the past years and loved the images I was getting but hated it for traveling or outdoor activities such as hiking. This past summer I picked up a used Olympus Em10 Mark II with a 20mm f1.7 prime and I have been so impressed. This setup is small and versatile and I take it EVERYWHERE! Image quality has been superb and some of my best shots are coming out of this little M43 sensor. I also love the way Olympus and Panasonic are constantly trying to innovate with their gear which is something Nikon and Canon have lagged on in recent years. M43 cameras do have their flaws, but there is so many positives to not give these cameras a try

I endured my Canon 5D throughout India, Nepal, China, Cambodia and Burma but having just come back from Japan, I felt like I really needed a much lighter and travel-friendly camera system. The clincher for Japan was just having my camera with a 70-200 f/2.8 in Tokyo peak hour in the trains... Right now I'm just doing my research into which system to invest into... Olympus or Panasonic

I really don't see one camera system doing everything for everyone. If you can swing it, Canon and Olympus systems compliment each other perfectly. One is small, compact and versatile. The other is large heavy and versatile. Their versatility overlaps somewhat and together they cover the spectrum of pretty much anything you could possibly encounter as a photographer. It's a bit like having a mountain bike for the trail and a racing bike for the road. You can ride the mountain bike on the road or the road bike on the trail if you have to, but they really excel on their own turf. I see APS-C cameras, and larger sensored mirrorless cameras a bit like the bike that's a bit to heavy to truly excel on the road and a bit too light to truly excel on the trail, but people keep trying to use them for both. Olympus cameras are awesome, and in decent to good light with the Pro lenses, their images are incredible and really second to none.
 

Yeah, I'm currently thinking of switching to a M4/3 DSLM (prob Lumix G85). They seem to really be hustling to innovate whereas Canon seems to be just sorta chilling on their updates.

I've been an amateur photographer for 40 years. Shot Nikon in the film days. Switched to Canon when they released the first affordable dslr. And switched to Sony when they released the A7 series. But, I'm 65 now and even the Sony GM lenses are getting heavy. Mostly do travel photography these days. So, I'm looking for a smaller lighter system. But, I don't know if I can give up full frame sensors.

If I'm a pro and shooting weddings, events, or portraits then I'd probably go high res FF. For everything else, m43 or APSC is just fine. People should invest time in developing the craft and skill or invest in good glass rather than a camera.

I currently use Nikon APS-C, and do mostly wildlife and landscape. I'm thinking about getting a Panasonic G9 to replace my(very awesome) D500. The G9 is a little smaller, notably lighter, and instead of getting a Nikon 200-500(which I rented a few months ago and LOVED), I can pair it with the Panasonic 100-400, getting a little better reach at about half the total weight.
 

I started travelling with gear back in 1990. Canon Eos 1n and several Eos lenses and tripod. About 12 pounds on my shoulder. The last 2 european trips were with a Sony RX100 and Lumix FZ150 with flex table tripod total weight 1.5 lbs. My E-Pl1 with a lumix 12-60mm goes on my next trip with a 25-300mm lumix ZS5 in my pocket. No regrets, its the eye as you know, not the gear.