I thought he was fantastic yesterday.
Came on, didn't give anything away defensivly, won some important tackles (even if they were school boy 'stick a leg out behind you' ones), some important headers, and most impressive was his forward runs.
There is no doubting Charltons ability, but I thought Lomax offered a new outlet pushing on, his ability to get up and down on the overlap for Taylor allowed Taylor to come inside (which he likes to do, being on the Left) more effectivly and although his final ball let him down a couple of times that will come once he's used to being in the side.
I certainly don't think he replaces Charlton, not yet anyway. But I think he did enought to give Shez another thing to think about, and if he gets a run in the side if Charlton is out with the injury I think he could potentially make the place his own.