M. Zuiko 45mm Vs. 75?

despite the focal length differences is the 75 mm really that much shaper edge to edge? I have the 45 mm right now and love it, but considering the 75mm, can still return my 45, I may need the extra reach for people photos. the price is the only detour for me, I can do it but maybe a stretch it it's really worth it however, I am willing to sacrifice anyone have experience with both lenses? thanks !