Quoted:
I have the opportunity to get a almost new Sony A7RII with a 70-400 lens for around $3k. I have a Nikon D7100 now, so it's quite the step up in technology. Anybody have any experience with that camera? I know nothing about Sony's.
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The answer is yes and no. It really comes down to what you want to do with it. Mirrorless is good for a lot of stuff, but sucks at others. Battery life is a huge negative compared to DSLR cameras as on example. I know several pro photographers that switched to the A7RII and went back to Canon or Nikon within 6 months. In some types of photos, I'd swap in a heartbeat. In others, or for general photography, I wouldn't. All comes down to your personal use.
Personally I'd pick up a refurb D810 for $2050 and pick up some other glass for the remaining $1000.
Pros:
-the Electronic view finder can do some really neat stuff.
-in body image stabilization
-smaller and lighter...ish. Some lenses make it as big or bigger than a DSLR with the same size lens. Only really smaller when shooting pancake lenses really. So a kinda deal.
-metabones lens adapters. Yeah, you can use pretty much any manufacturer's lens on your A7RII. Downside is certain combinations will permanently kill your camera. They are usually pretty well reported unless you're doing something weird though.
-3 layer sensor can do some awesome low light shooting.*
Cons:
-downside is I really hate that it looks like I'm looking at a TV instead of what the lens sees. But that is how mirrorless work.
-AF gets weird in low light
-1 SD card slot
-no cheap Sony lenses
-no real Sony aftermarket/used
-no complete line of Sony/Zeiss lenses yet
-a lot easier to get crud on your sensor swapping lenses
**except astrophotography as the latest firmware kinda fucked that one up hardcore.