How true is the sizing of Cannondale?

I’m aware each bike manufacturer has different sizing. I’m 5’11 with 30.5 inseam, on Cannondale I’m on 54 size.

I know bike fit would help, but just as comparison on Pinarello sizing I’m 53/54 and ended up with 54 when I bought my Dogma F12 almost 5 years ago.

American sizing like Specialized/Trek I’m 56, which my Aethos is perfect but Emonda is slightly longer on the reach.