Had two patches of 333 this year, one patch of heavy land went under water and yellowed out but still made a little over 2.  The other, on better draining mixed land, was in the middle of  499.  Really wasn't much difference between them, even at defoliation.  Definitely wasn't a week earlier, maybe a couple of days.  Gonna try some this year but won't be replacing 499 yet, its been REAL good for us.