The worst weaknesses are gone, yes.

[The sunlight was a big one. He'll miss the warmth of it, the color daylight affords the world, if and when things ever revert back to "normal."]

However, a few other traits remain. The lack of a reflection, or the fact that most food and drink tastes like a poor imitation of itself. That sort of thing.

[The lingering scent of death, a colder touch, never aging, not remembering most of his past, weak to radiant damage, always, always hungry--]