If one really wants to do a comparison, I'd suggest one do a weekend rental of the high end glass. Find some targets that really demand high resolution and shoot same with both lenses. Cookie did this once when she suspected her filters were the source of some barely noticeable image degradation. Her target was a distant realtor sign with quite an array of large and smaller fonts. Without the filters one could read every line in the images. With the filters, smaller fonts were completely illegible. With that, $250 in filters fell in the round file. All her lenses go commando now.
