Coil Size comparison?

Has anyone done a comparison of the 11x13", 11", and 9" coils ...in terms of real life differences in separation and depth?

I have an 11 but curious what I'd gain/lose if i went to a different coil.

I'm very anxiously waiting for the new coil to see how it does too....but...still waiting *taps foot impatiently* ;)

anyone have any youtube videos or write ups comparing the other options?