I used Nikon DSLR's and film cameras professionally but as soon as I tried my first Sony A7II I was hooked on mirrorless and having a live view EVF. Sold all the Nikon because they were dragging their feet, saying things like, "Mirrorless just isn't there yet", even though I knew it was, and that mirrorless was the future going forward. I’ve been very happy I made the switch years ago and I enjoy using Sony bodies that are compact, very customizable, E-mount lenses that work on both full frame and aps-c bodies, the quality and durability of Sony bodies/lenses, the flexibility and dynamic range of Sony RAW files, great AF in general including eye AF and other subject tracking, plus great quality lenses that are sharper, smaller and lighter than competitor's equivalent lenses. Regarding lenses, I love the G and GM lenses plus the variety and multitude of 3rd party lenses available - from Zeiss to Voigtlander to Viltrox and others - something for every budget and purpose. I also have had great experiences with Sony Pro Support at a reasonable yearly fee, enjoying evaluation loaners and discounted repairs (although I've only needed one or two repairs over the years with Sony as opposed to many more during my Nikon days). Plus this is a small thing, but it really bugs me that competitor's cameras use two different memory cards for their cameras, I like Sony's approach of their cameras using either SD or CFexpress type A for the same slots. Overall I see nothing out there in the market that would entice me to switch.