There is a difference, though not as much as I thought. I measured the actual video area best I could "by eye". Here's the width x length x diagonal for the Diamond, Touch, and Q9c respectively:
1.67 x 2.22 x 2.75
1.69 x 2.26 x 2.82
1.45 x 1.94 x 2.41
So there is a difference, but not much
Todd/Indy