Thank you nycphotography for reply.
I agree.
I also had Specialized Tarmac (2013) at size 56, that fit me just fine.
Btw. I have a feeling that when I've set the bar at the lowest position I would be more comfy having longer stem.
Cannondale at size 56 also fit me fine.

Anyway, I already ordered Emonda SLR 6 (H2 geometry) size 58 (was for better price) and am waiting for it to arrive, will post my impressions later.

It seems like Trek Emonda has different sizing than other Trek models (for example Madone at size 58 was much bigger and I'd be better at size 56).

Hopefully I'll be happy with that size.