Chony...it is the circumference that I speak about..and YES, I have them both, Well the T2 was recently sold to my friend).
The T2 is very deep and is hard for me to grab with 1 arm. To me the PA2 is easier to grab..I said it is 'heavier'..but as Ian says not all that much..

I have short arms but...I'm pretty strong.

You missed my point...76 keys is not the deciding factor in portability.
It is the quality/type of build in most cases.

Try moving my Kurzweil K2600X around (88 notes) BUT, bands do all the time..they are really built to take it.

If my main thing was to take it daily to assisted living centers for a couple hours playing..I'd have a PSR S900.

But, not everyone needs the portability.
Probably 80% don't need it, maybe more.

Lee S.