I'm not a Sony fan so am not overly read up about their products - - - - but with your mention of the 3 new lenses released at the same time as the Sony A6300 - - - I don't think they will benefit this new body much. They are all Full Frame lenses from what I am reading. It seems like the Sony efforts for introducing quality lenses are with the large FE lenses and not for those desiring properly designed APS-C lenses for the likes of this new body. It's too bad.
These APS C cameras are indeed fabulous and small, perfect for that second camera if you have a full frame Sony too or any camera as it will take most lenses with some adapter. I use Pentax screw mount lenses of great vintage, Canon FD, vintage German glass, Leica Etc.
But what they are offering to me is extra reach, putting those pixels on a bird or lion far away for little extra money on my part and ultra fast tracking.
But of course, except for wildlife and sports, we can do almost anything with any camera. I happen to like the Sony build of the image with the A7R, original version. It fares pretty well with the 80 MP Phase One in 30"x50" prints. There is just a tad more observable resolution in hair, but the Sony punches higher than its bantam weight!
Right now, I have dropped back to a Canon 6D as one of my sons "needed" the A7R, LOL! It was like trying to convince a Republican that "Global Warming" is, in significant part, the consequence of our production of greenhouse gases! In the end I just let him have it! I actually felt that a 5D mark I would be perfectly adequate but that was dismissed. In the end, I decided just to make him happy!
It's hard to convince folk out of their current bubble of delusion!
Thank goodness, my son has not joined some sect or worse!
It's just a camera!
Asher