I've also come from an ST albeit a 2017 Focus, now got a 2016 GTI with the performance pack.
It's a lot more comfortable and smoother to drive than my ST was but I do have to work it much harder than the ST but that's not a bad thing!
It's a lot better on fuel than the ST when just cruising too which is a bonus!
I was very happy with my Focus until a couple of issues (real bad rattles, sat nav/infotainment system kept failing and keys randomly not being recognised so wouldn't start intermittently) cropped up late last year to which my local dealer told me they won't fix them under warranty and to either pay them to fix them or fix them myself! Fords customer care/service is about as much use as screen door on a submarine! Useless! They were so unhelpful so I just thought 'f**k you' and traded it in for my Golf!
I've only had it about 3 weeks so I'm still getting used to all the bits and bobs myself too! Lol!
Overall I made the right choice I think, its more suited to my needs
Booked in to have it detailed as it's covered in swirl marks and it's annoying me so once that's done I can do a couple of small bits to it to make it 'mine'
Still a Ford man at heart though albeit old skool Fords!