Testing lenses by shooting targets and graphing the resolution line pairs is interesting, compelling and.....silly. Most high speed lenses don't do "great corners". And in either image above the ability to have great performance in the corners is beyond meaningless.
To read the DXO reviews of Canon's fast primes you would think they were all designed by morons who couldn't make sharp glass if they broke it into little shards. But very few lenses are really computed with intention of being flat field, macro lenses.
