I picked up a Fujian 35mm f/1.7 as my first adapted lens. And I've totally fallen for it. The focal length, at 70mm equivalent, resonates with me better than any other prime in my bag. The Fujian is a great lens for the money, but it's got clear limitations. It's not super sharp, I can't tell what aperture I'm at if not wide open, etc. But it makes me want to get a "nice" fast 35mm prime to adapt to my Pen. Ideally f/2 or faster, compactness a plus, and some "character" appreciated. Under $500, what are the best options?