ATC's - 10's vs 20's

I recently purchased a pair of the Active 10's, circa 2004. I had always wanted to try a pair of ATC actives, so I hoped this would be enough of a taste to see if I liked the sound, despite being "small" speakers.

I love the sound - as most have commented, very honest sounding speakers, which is great for great recordings, something less than great for lesser recordings. I am relatively amazed at the fullness of the sound in a LR for something that is touted as a near-field monitor.

Anyway, my question is - has anybody directly compared the active 10's to the active 20's, and if so, how much deeper / fuller is the sound from the 20's? The specs don't make it appear much, and mid/woofer is only a bit larger. I'm confident that the Active 50's would be a whole other world, but I"ve read that the 20's are really a sweet-spot in the line-up.

Appreciate any feedback from someone who has heard them both.