The thing is, old SK was better than other teams mainly because of their communication, which was one of their main strengths, not because they were the most skilled, they relied heavily on team play and communication, which is obviously easier when they were speaking their native language, now they'll have to speak English, s1mple's English is decent, although far from good, FalleN has good English just his accent is a lil' bit weird, fer and cold have terrible and almost non existing English, and flamie has decent English...
Comparing this to FaZe's players (talking about communication in English only):
NiKo > cold
karrigan > FalleN
olof > flamie
GuardiaN = s1mple
rain > fer
(talking about English, I don't want to be misunderstood)
FaZe's communication will be better than SK's, and SK will also have a harder time getting their chemistry back and I don't see s1mple and cold for example being friends outside the game.
Meanwhile, just checked reddit, and olofmeister said that FaZe's chemistry is really good actually, and he thinks that it's better than the old fnatic lineup he played it, but on the other hand, FaZe have mentality issues, but on another hand, s1mple doesn't have an experience playing in big matches, and under the IGLing style that FalleN brings...
So yeah, but talking about players head to head, it should be something like this:
NiKo > coldzera (Can't really argue, NiKo has been far better the past 3 months or so)
rain = fer
karrigan < FalleN
GuardiaN > s1mple (as an AWPer)
olofmeister ? flamie (Flamie motivated is a beast, but olof can have good form)
But then, you look at SK, they will have a honeymoon period going into tournaments.