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Here's a test on 7d with firmware upgrade to 2:
1000x lexar 32gb 34 burst cleared in 7 seconds
533x adata 32gb 28 burst cleared in 18 seconds
266x patriot 16gb 26 burst cleared in 24 seconds
So the card does matter in burst length and clear speed.
Both of these are significant in shooting wildlife or sports, with the clear speed mattering more to me, because after your buffer is full, you are paralysed to a slow speed while you miss shots.
As well the conclusion is that you can't compare numbers posted here because differing settings (iso, shutter speed, will effect the results - they need to be standardized).
[all above at M, 1/2000, iso 100, f4, high burst, auto focus with same lens on same spot with same exposure setting.]