Why would you give Comet the first? Just Curious. he's up there is strength, speed and durability etc and one of DC's top notch TKers but his TP feats are on teh average side to a degree.
Post resurrection (Mystery in space) He got a MAJOR Psionic upgrade. So much so that he casually defeated 7 clones of his pre resurrection body in a TP fight. Also while it took almost a dozen of them to alter a single memory of the Wierd (who has TP resistance feats vs MMH) post resurrection Comet completely rewrote his mind to clear it easily.
The trade of was he was no longer anywhere near as strong, durable or fast as he once was physically. He also gained teleportation.
He was able to shield himself from Synnar, could casually block an GL attack and as you said, he was physically quite impressive. From the Rhann Thanagar War I had the impression that he is a notch above the GLs.
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Well he has repeated feats of tooling GL's pretty easily ( Sinestro, Hal twice, Kyle) so yeah can't deny that. Primarily through his TK which there is no denying is top notch DC. In TK I'd place him above MMH.
I assume you mean shield himself from Ominar Synn not Synnar right? His feat of TP breaching Synnar has context. It was clearly shown that Demiurges allowed this to happen and once he'd let Comet see what he wanted him to easily shut him out.