The 28 2.8 is 1/4 the price of the 28 2.0 and takes the 49mm filters. I am certainly no expert but I love my 28 2.8 to death. If I was stuck on a desert island and could choose but one camera and lens I think I would take my OM2N and 28 2.8. Have never used a 28 2.0 but I adore the images from my 2.8