Note, based on my own "seat of the palm" feeling the F1 has always felt heavier. Various specs online also confirm his: F1(n): 820g (or 795g if New F1), F2: 730g. I don't personally own an F-1, but a friend does and it's always felt like a solid brick of metal to me.
Originally Posted by SchwinnParamount
Stop worrying about grain, resolution, sharpness, and everything else that doesn't have a damn thing to do with substance.