Hey all. I've recently been using my 30D on the beach as I'm too paranoid about sand in the 7D. Interestingly enough I'm finding I have been getting sharper images from the 30D than the 7D.

I want to start a process of elimination to see what it might be and was after some pointers. This is the way I was thinking of going:

Use the same subject (input on what to shoot for the tests would be greatly appreciated) and same lens at same settings on both bodies, take photos through the f/stop range. Repeat for all lenses. Compare results.

Would that be the best way to go?

The reason I'm asking is I was told by Dennis Cale a while back that 18mp+ on a crop sensor may cause a type of distortion at the edge of the pixels which results in loss of sharpness. This was when he was discussing my 30D saying that 8mp on a crop sensor will probably be sharper.

I'm just wondering if there's any truth to that or if it's just that I haven't got my head around the new camera just yet.

Cheers all. I appreciate any and all input.

-Paul