Well, I had to change the FD cables since they were hard to shift but now it's much smoother.
My main concern though is still with the FD I sometime have to push it twice so the FD can go on the big ring

Other than that, well I don't know... I only tried an ultegra once and the shifting felt more ''clicky'' and a bit harder to click to the next gear but when I was shifting it was faster and had less hesitation than my Tiagra/105. My guess is that the cables were badly tuned or something.