We don't know how popular the T5 76 key version is yet . As far as I know no numbers have been obtained by anyone
It's all speculation but I know of some very unofficial numbers that a particular dealer(of course he will remain unnamed ) was selling T5-61 at a 2 to one margin to the 76 key model. At the PSR forum many I have been in contact with half dozen owners of T5s who purchased the 76 key model. Have to believe the 76 model launch has been a reasonable success ( only my opinion).
A couple of weeks ago Tony Mads ( Pa900) and myself(Pa3x 61) got together for a jam. Although we did not A/B the boards I didn't hear a lot of difference between the 900 and the 3x, maybe next time we meet we should do an A/B comparison.