When the original 12.9 pro came out, I thought it was big and heavy when I held one at work that someone brought in. I wouldn't want to hold it for extended periods of time.Not exactly the point your trying to put forth, but I found the 12.9" not to be very holdable. It had to be on a desk for extended periods. This was one reason why I returned the 12.9 and opted for the 10.5 last year.
I wonder with the smaller bezel's of the 11, how holdable it will be, I find on occasion my palm hitting the screen area on my 10.5, that must be even more of an issue on the 11"
I don't know about the new 12.9, but the 11 inch iPad pro feels as easy to handle as my iPad Air 2.