I've been making serious considerations about coming over from m4/3. I'll get out of the way, that I understand that its the photographer, not the camera that matters. But I feel somewhat limited and have been mulling the change for a while so this isn't an impulse. A little history, I currently shoot an E-M5 II. Prior to that I always shot Canon. I started with a Rebel, then a 50D, then a 5D II, then for some reason I ended up regretting, I moved to a 7D. Then I sold all the Canon gear and bought into Olympus. The downside of this conversion would be I have a TON of Oly lenses. 17/45/75 f/1.8, 12-40 PRO, 40-150 and 14-150, kit lens and the powered EZ lens. The switch to Olympus was primarily due to kit size so that still is a concern. I don't think the A7 II is a lot larger than my E-M5 but the lenses will for sure be larger. My negatives on MFT are really low light performance and DOF. Neither of which can really be fixed. I can get DOF going long, but I still have to deal with low light issues in a lot of cases and you can end up with some awkward working distances e.g. 75mm f/1.8 is like shooting a full frame 150mm f/3.5. I've looked at the E mount FF lenses and there definitely is a dearth. Nothing small and nothing inexpensive. So that's probably the big negative. There are some options on the E mount APS-C side but APS-C mode on the A7II is 10MP if I understand. If lens size is a big deal maybe I should also consider the A6xxx series? So if I put together a FF kit what would I get? A7 II or wait for A7III since I have a system and am not in a huge hurry. Kit lens: 28-70mm f/3.5-5.6 - $300 if purchased with body. I know this is a weird comparison but I've spent years thinking like this. So this would be like a 14-35mm f/1.8-2.8 in MFT terms, right? So that would be equal or better to my 12-40 PRO but with just a bit less zoom. My understanding is also that this lens rates pretty well objectively, even though it is a kit lens. I don't think this combo would be huge compared to my E-M5 II and 12-40 PRO combo. Portrait lens: FE 85mm f/1.8 - $600. This would be like if I had an MFT 42.5mm f/0.95 (right?) which would be insane. Standard prime: Either the 28mm f/2 for $450 or the 35mm f/2.8 for $799 or the 50mm f/1.8 for $250. The 28 seems too wide considering I had some regrets going from the 25mm to 17mm Oly. Therefore, the 50 seems like a no brainer. Finally, I might buy a longer zoom for utility and portraits. Again, considering f/5.6 in FF is equivalent to f/2.8 in MFT, I could get a 70-200 f/4 or 70-300 f/4.5-5.6. So starting out conservatively I could get into the Sony ecosystem for what, $2700 if I held off on a long zoom. I'm sure I'm not the first person to post a similar thread but I wanted to give my own story. Sorry if it is redundant. Has anyone made the switch and regretted it due to lens selection or system size? Who has made the switch and never looked back?