I made the switch to mirrorless in late 2018 with the Sony A7RII. Sony had given me a loner camera a year earlier that let me know that the quality was at least equal to my previous Nikon D810. I had also spent over a year with an a5000 as a every day carry camera that has gone everywhere with me, and made me very comfortable with the Sony image quality. The ability to put together a very light 42mp camera kit with high quality lenses for hiking and backpacking is what tipped me over to Sony.
I am really happy with my choice, which came down to image quality first, high quality light-weight lenses, and overall compact form.
This page is not meant to be a complete review, but a place to hold important reference information and some miscellaneous info for A7RII users or perspective users.
Spreadsheet of select E-mount lenses assembled to find lightest weight options. Really good lenses tend to be heavy, but for backpacking some quality sacrifices are acceptable. The question is, do I carry three average lenses that are light, or just one decent zoom? Sigma has teased Art quality lenses in a lighter form factor which would be my preference. My landscape work is mostly at f/11 anyway, and a f/4 or f/5.6 might be a good fit for street photography too.
Wikipedia article on E-Mount lenses – list of lenses, adapters, other interesting stuff.
-Batteries not keyed to prevent wrong way insertion
-Lens release on opposite side of Nikon/Canon
-Lens index mark location on flat instead of outside of lens mount
-Direction of lens rotation opposite of Nikon
(This lens stuff really annoys me as a 30+ year Nikon user. It’s hard to overcome that muscle memory, but even then, the Sony way just seems awkward. Fair or not, it’s my gripe)
-Large RAW file size – Nikon uncompressed NEF are much smaller. Takes up more memory card space, longer transfers, etc
-9 frame RAW buffer – older body with a lower costs comes with trade offs – works for landscape photography, but is still noticeable when doing brackets
– small grip size, feature and bug, works great for my normal landscape/fine art stuff, but shooting a multi hour event with heavy glass really begs for the extended size battery grip.