I waited - only $400-$500 less used. Still waiting' and my heart keeps hoping for someone giving away a Leica M .
IMO with 1st gen A7 series bodies there is an expectation that they're placeholders for more mature products down the line. Adding to that the fact that Sony aggressively discounted them less than a year after release, and you end up with cheap used stock. I sold my kolari mod A7 for ~$950 less than what I paid for it, filter conversion costs included. Not a bad deal given how much photography I got out of it, but a lot of depreciation nonetheless.
As a revision to this question, my take is that the bulk of improvements are not immediately obvious. Some examples:
- The ability to set min and max auto ISO. Do this once for an event and you're set for the whole thing.
- Eye AF is by far the fastest way to shoot environmental portraits
- EVF color accuracy has improved significantly
- OOC colors also improved significantly. I shoot Raw+JPG and it definitely helps with culling files.
- Loseless RAW helps with extreme exposure contrast scenarios (fireworks, night long exposures)
- TTL accuracy seems to be improved as well as sync speed
- In the 7rII you can map silent shooting/hard EVF/LCD toggle to physical buttons. If they would also allow AF w/ shutter to be mapped, I'd never have to look at the menus again.
None of these alone is a dealbreaker, but taken together you're getting your money's worth in small increments. Sure, $2,700 is still steep, but it's not as if you're getting any more camera for the same money from Canon or Nikon.