How many times are you likely to use the 28mm f2 at its widest aperture?....Will it be enough to offset the inconvenience of having to cart around seperate size filters?.....As has already been mentioned the 2.8 version is far cheaper.....When I used Olympus I had 28mm 2.8, 50mm 1.8, 100mm 2.8. A compact outfit with all the same size filters.
Actually, the 28mm f2.0 Zuiko uses a 49mm filter, same as the standard lenses.
"She's always out making pictures, She's always out making scenes.
She's always out the window, When it comes to making Dreams.
It's all mixed up, It's all mixed up, It's all mixed up."