Your best lens and the runnerup, any format. Based your determination on such things as resolution, contrast, saturation, bokeh, or just the look it gives. Not by usefulness.
My two top picks 1. MF Rollei 80mm Planar F2.8 HFT. Really sharp, great contrast and saturation. Gives a look that I have not been able to get from any other lens. 2. A hard pick: Probably my old Nikon 50mm F1.8 N model, although the Nikon 24mm F2.8 is a hell of a lens. The 50 edges the 24mm just because it's an outstanding lens for the price and it's sharp. The recent 50mm D lags behind.