So, having now played with some of the features, very nice. Mostly, modifying the background is now much quicker as you can use the select subject feature and then invert.
But, I had missed that Adobe finally came out with R5 profiles (as well as R3 and R6). This had been a major complaint.
Finally, and I need to play with this a bit more, but I have noted occasional noise with the R5 where I was not expecting it. Well, I haven't seen that since updating to the most recent R5 firmware. But, also, even going through old Laguna Seca images with the new Adobe software....the noise looks a bit better to me.
I'll still want to do the DXOPureRaw v LR comparison later this winter.