I sold all my full frame stuff around 5 years ago and bought an Olympus EP5, which is the predecessor to the the Pen F. I had all the gear, Nikon D700 with the pro lenses and a Leica M9, but the move was a good one for me. Key benefits are I can now take it with me practically anywhere (it fits into my framebag), the IBIS is great, and I love the look of Olympus lenses. I use the 17mm f1.8 and the 45mm f1.8. The 45mm is my favourite, terrific for portraits, super sharp, and very small. I did also have a Panasonic GH4 and 7-14mm f4, but never really liked it, so sold that a while back. I don’t know much about the M10, but Olympus are great at stabilisation and their lenses are as good as anything I’ve used, so doubt you will be disappointed with whichever one you choose. Also, I’d consider used lenses from Wex Photo or MBP. Most that come up seem to be in excellent condition. I imagine they mostly come from hobbyists rather than pros, so haven’t had the same level of use.