Seems to be on par with my S5, 1-3 db better which isn't much. Haven't had much time to check my usual spots around town so I wouldn't know how well it holds onto signals and whatnot.
On a related note, I have notice that sometimes I see the dbm jump up by 10 or more sometimes while holding the phone, haven't been able to pinpoint the cause but I'm wondering if anyone else has noticed the same.