Liosse de Velishaf
Banned
But if you add grittiness to Tolkien, don't you arrive at Martin anyway?
"A Tolkienesque fantasy done in a gritty fashion" is how people generally describe A Song of Ice and Fire as it is.
(Or do you mean gritty = gory and rapey instead of gritty = gory, rapey and morally muddled? I'm not sure you can really do gory and rapey without morally muddled, to be perfectly honest)
Martin is low fantasy, whereas Tolkien is high fantasy. There's actually a lot of difference between them besides the grittiness.