Did we ever get a verdict on the UT50 vs ST50 for input lag?

I've seen some shoddy video on the Shoruken forums of some guy showing off his UT55 "low" lag that I found dubious and then some guy on slickdeals yesterday claims he loves his UT50 more than the S30 from last year playing Halo 4!!

I was floored. Everywhere is pushing ST50/30 and it's a huge leap in price for me to consider when I haven't even heard a side by side being done. I plan to play FPS online so...