Nice bike.

It seems like every bike company has different sizing and the dimension that matters most on fit is NOT the seat tube length. Assuming you have enough standover or you are comfy enough a rider to angle the bike and come off the saddle to put a foot down, it's often irrelevant.

All that said, the Bianchi has compact geometry and seat-tube based sizing, as you can see here: Infinito Ultegra Di2 | Bianchi USA

Notably, the "59" has a 57.5 top tube. This makes it notably more likely to fit you.

By way of comparison, I'm 6'3, and need a 58.5-60 cm top tube. I also have very long arms, which means I can tolerate a lot of drop and I like long stems.

I'd suggest you go out and measure your hybrid. Virtual top tube, seat tube, BB spindle to saddle, and perhaps saddle-nose-to-stem-clamp. That will give you a good baseline so you know how the fit will be different on this thing.