Well I don't think Fuji will be re-designing lenses for a higher MP sensor. At least I don't think so. I do remember the days when I used my Nikon bevy of lenses on my D300, D700 and D3 which were 12mp cameras and then upgraded to the 36mp D800E beast. Honestly, other than having to manually fine-tune each lens to the D800 I did not see any degradation in image quality. But, these were all Nikon lenses; I'm not sure how third party lenses would have fared back then as I didn't own any. Personaly, if I were to by the XH-2, I would have no qualms whatsoever using ANY of my Fuji lenses with the upgraded 40MP Body.