I'm guessin that those that want a great sounding 76 key arrangerd, those that ABSOLUTELY MUST HAVE A 76, for one reason or another, will end up with a T5-76. Now, what percentage of the arranger keyboard players that constitutes is up for grabs at this point, but I'm bettin that it's a lot less than 40 percent, especially if the pricetag is significantly higher. Just a guess, mind you, but from the standpoint of someone that has been around the barn for more than 50 years.
Cheers from on old codger,
Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)