Not a lot of sharklet input yet, but one procedure that has a tight turn to a short final has been an issue with energy management (180 incl angle). Luckily there is room to open it up a bit. (this is an RNP procedure, so there is good track data)
Seems to be pretty slick ac compared to the non-winglet variant.
ZFT, you are saying there is no payload difference on the sharklet compared to non-sharklet?