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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.
Oh shimano why can't you be straightforward.
Looks like my plan of switching out the 7800 shifters for 5700 105 for hidden cabling and newness is flawed.