I think that colours look different at different times of the day and in different lights and they can have a 'tone' about them. A background colour I suppose. Some greys can look like they are edging towards green and some like they are edging towards blue.
I'm afraid I don't know how it would look. But I will say that if you like grey then go for it.
We covered a lot of wall with it and I was worried it would be too much, but it really isn't. It looks beautiful and doesn't look to dark or dingy.
Our living room is painted lamp room gray. It is a big room and we really like it. It is more green than muddy, although is a real true grey. It is not as dark as we thought it would be. The Little Greene greys were really very green.