I found these on YouTube. They are honestly the best comparison videos I have seen on YouTube.
Video 1: http://www.youtube.com/watch?v=qgBmFmphKyQ
Video 2: http://www.youtube.com/watch?v=cfs3M8-OUbw
Video 3: http://www.youtube.com/watch?v=u-APfJL3Wqk
Video 4: http://www.youtube.com/watch?v=FF7Q0xLRJ-8
Video 5: http://www.youtube.com/watch?v=vVGzRXKgeNo
Video 6: http://www.youtube.com/watch?v=y3WNfZJJxiM
Video 7: http://www.youtube.com/watch?v=LI6KbHU20K8
Video 8: http://www.youtube.com/watch?v=YRydae9ABBw