I have the Hellraiser C7 which is very simular to Loomis. I went from Ibanez to Schecter 7. In the beginning it felt OK. A little bit hard to play, but very manageble. Now lately, I've enjoyed it really well. Once I got used to the neck, it really feels normal and comfortable. Even for my "short" fingers.
If people can play on 8 and 9 string, and really huge bass guitar neck, then I see no reason why you cant play a 7 string Schecter. The necks of Schecter arent that big as everyone claim them to be.
I'd say go for it. I love both my ATX and Hellraiser, GASing for a loomis too. Those guitars are REALLY resonant. You can hear and feel the harmonics, and they are one of the most accousticly resonant guitars I've played in this price range. I like to think that its the thick neck that deliver this beefy and harmonic resonant sound, but Im not a wood tech..