Not sure on a comparison but my Ultegra Di2 (R8070?) are much shorter than the regular non disk shifters. I find them less comfortable that the regular ones on my other bike.
Interesting. I have some trp hylex levers and I am looking for something shorter. How long are the r8070 from mid bar to the levers start to turn up. Like this drawing with trp hylex (59mm):
Not sure on a comparison but my Ultegra Di2 (R8070?) are much shorter than the regular non disk shifters. I find them less comfortable that the regular ones on my other bike.