I've been to Whitfield for both dinner and brunch and my impression was the same both times--just meh. The food was good, but not great. The service was fine, but not stellar. I think the restaurant is too pricey for what they're offering and wish they would be more willing to accommodate special requests (e.g. egg whites instead of eggs in an omelette).
The location is the Ace Hotel is super cool and unique, but the restaurant seating is tight, so you're right up next to the table next you in many cases. It is also extremely loud.
None of the food items I had on either occasion stood out to me as stellar, but the blueberry-lemon pancake was definitely good and unique (a sort of cross between a pancake and a donut).
I would go back to Whitfield if someone else wanted to, but when it is my turn to pick a place, it definitely won't jump to the front of my mental queue.