Unfortunately I didn't take pics of it, but I've seen the 20 and 21.5 side by side, alongside a 24 and 27 at one of my local Best Buys. The 20 and 21.5 were just about the same in size, and the 24 & 27 were virtually the same as each other as well. So if you've ever seen a 20 next to a 24 in the past, you've pretty much already seen the same thing as a 21.5 versus a 24.