I'm a Shimano fan & will remain that way going forward.
Experienced with Ultegra & Dura-Ace 11 speed. Curious about the new 12 Speed Design / Mfg so I upgraded
my 11 speed Dura Ace
I should have paid a bit more attention to the design differences of the Levers.
"The lever body reach is also extended by 4.6mm" - I did not pay attention before the upgrade.
The new levers definitely affected my fit / comfort, which is very sensitive for my body. It's been a recent change and plan more work with my Bike Tech & Bike Fitter to correct. I've also ordered a shorter Stem just in case we
have to swap out.
However, The advantages = elimination of wires, lightening fast shifts & looks outweigh the short term hurdle.