Is there is a big difference between these two lenses in terms of optical quality? Tokina 19-35mm replaced Tokina 20-35mm. 20-35mm is heavier and better built. I can buy a new Tokina 19-35mm or a used Tokina 20-35mm for the same price. I am little uncomfortable buying a used Tokina 20- 35mm because KEH does not say whether they have the version I or II of the lens. I know version II is compatible with Elan II but does not whether version I is compatible or not. Also KEH have some lenses at 72mm filter size and others at 77mm filter size. I will prefer to buy the current model (19-35mm) new, unless 20-35mm is clearly better optically?