I've had experience with both and my impression is this, both lenses will be sharper than the film you put behind them, the Grandagon tested a bit sharper at longer focus distances and had a larger image circle with less vignetting but was larger and heavier. The Super Symmar was smaller, lighter, higher contrast and resolved better at close focus distances, but had higher vignetting and distortion. I've since sold the Super Symmar XL and haven't missed it.