Honestly, I think the difference in a 40x30 print would be noticeable. Viewing distance has really changed in this day and age and most people still think you should be able to walk right up to a print of any size and see great detail just like zooming in on the computer (I am talking non-photographers here since most photographers should understand that). Hang a 40x30 in your house and watch how many people walk right up to it to view it. This is why I limit the size of prints I sell to 40x30, the good lenses can pull it off for up close viewing.Good point Barry. For large prints at normal viewing distances, the difference is likely not noticeable. It raises the age old question of "How good is good enough?".