What about variations in drunken state of the viewer?
"I love my Verito lens, but I always have to sharpen everything in Photoshop..."
Or the comparative assessment is made at a distance proportional to the enlargement size of the print.
But comparing different sized prints at arms length is less revealing.
"There are a great many things I am in doubt about at the moment, and I should consider myself favoured if you would kindly enlighten me. Signed, Doubtful, off to Canada." (BJP 1914).