I was an early adopter of Micro Four Thirds back in 2009. I sold off my Canon 5DII and L lenses after I purchased the little GF1. It was a revelation. I enjoyed Micro Four Thirds for a few years (GH2, OM-D E-M5), then took a detour into Fuji Land for about 3 years. Last fall, I checked out a Sony A7ii, and decided it was everything I wanted and needed in a camera body. For me, getting back to full frame is yet another revelation. I am currently using the A7ii with adapted manual focus lenses (mostly Contax C/Y), and only have one AF lens (FE 55/1.8). I do a LOT of walking around NYC (150+ miles/month), and I decided that wanted a smaller, lighter, but still high quality ILC body that could be stowed in a pocket or very small bag. It had to have an MFT sensor or better, and an EVF. I was going to go for the new Pen F, which is amazing, but it is nearly as big as the A7ii. I eventually discovered the Panasonic GM5, which fit the bill perfectly! Reminds me of the GF1. I am having a blast using the GM5 with the Pana 42.5/1.7, as well as with my manual focus lenses. It's not going to replace the A7ii, but I will probably take the GM5 out more often, and I won't be worried about losing much, if any, IQ. I've done some side-by-side comparisons, and it's closer that I would think. MFT has come a long way! About the ONLY thing it is missing for me, is IBIS. But the small body size is worth the omission. A GM7 with 20mp and IBIS would be the dream. Photos below are all with the Panasonic 42.5mm f/1.7. An amazing all-around lens, and perfect for the type of photography I like to do. 85mm (equivalent) is my favorite FOV, and the close-focus ability of the 42.5 is perfect for flowers and other details. I really don't need a dedicated "macro" lens - the 42.5 gets close enough, and has truly incredible IQ and rendering. Pana 42.5 f/1.7, all wide open on a GM5.