I'm in that weird camp I think it look too clean, but I can accept that this is a non-issue for most and a natural thing when the game is being brought as an HD Remaster port.
The murky kind of grainy look worked well for the type of game it was, as it reminded heavily of old zombie and horror movies, which have that sort of murky grainy look to them. The lack of clearness can add an element to make things look creepier. The main thing that bothers me is some of the lighting makes some areas way too easy to see, like the staircase to the cellar looks better, but it's lacking the shadows the original had. And the zombies updated models makes you see them very clearly, which is both cool but also I don't think they look as creepy with the added clarity and details. The details are nice, but it seems to detract from the creepiness of the zombies to me because I can see them too clearly.
This is really a series of non-issues I know, but just some thoughts. I'll still buy it, play it, love it, and I can always play the original if I want that original effect, but just some thoughts of how it might detract from the horror and atmosphere if the lighting is too bright and the picture is too clear, as both things sort of take away from the old horror movie feel the original had. I feel this is all going to come to taste, though.