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Do you mean the levers or the calipers? The 7800 calipers are the most powerful road brakes I've ever used, they're mega.
Just changing the shifters rather than group, I've got 11sp Shimano on the croix and I prefer the shifting action of the more recent stuff to the feel of the 7800 units.
Looks like I'm going to swap out the shifters and the front mech, and just clean off the 105 logos.
That's a down-grade anyway, although the brakes got better.