Not many interesting players in CoH2 but a few I can think of are VonIvan and CcArtSO3. With VonIvan, he's a high tier player but he also plays every faction(Exceptionally well I might add), and he uses unorthodox strategies; there's simply no other player in CoH2 that can do what Von does.
As for SO3, if my memory serves me right, he was a high ranking(Top10) 1v1 ranked Panzer Elite player in CoH1, and he played PE exceptionally well; I always enjoyed watching replays of his in CoH1 and while he isn't as good as he used to be, I still consider him one of the better players of CoH2 due to the fact that he's a CoH1 veteran like myself, he was one of the better PE players in CoH1 and he has really good micro.
There's simply not many interesting players in CoH2. In CoH1, we had Aimstrong, Sepha, CharlesDarwin, deadbOlt AKA IPlayForKeeps, Marines(z?) who invented the 4ES strat, Morello, Dr Horse and Guderian from the RUKAcl clan, Tomitoma/Contador, IronRoman and the list goes on for a bit.
CcArt and his friend were the bastards that broke our 2vs2 +73 win streak with my friend in 2vs2, back in COH 2 early days back when maxims raped everything, and flamehalftracks roamed the battlefields.
CcArt would modify his army during the game so when he got panthers out, he would only have Tanks and pioneers to repair them, nothing else, and his teammate would provide the anti infantry support.
CcArt and his friend were the only "tought opponents we faced during those days", either we beat them or they beat us, Damn CHINESE!