Here is the thread revan1013 is referencing (I think). It contains a link to the spreadsheet comparing different leading protein brands. It also has a fairly bold disclaimer about the quality of the testing and the need for third parties to be doing this sort of work. That said, this thread is how I found Optimum Nutrition a couple years ago and I couldn't be happier!
Yeah, I would say this is a pretty is 'disclaimer' "I want to state that I know me doing this is ridiculous. But it is not ridiculous because my testing method has a large margin of error (of course it does)". So some random guy on the internets does some testing in his Mom's basement then posts it to Reddit, I am going to go out on a limb and say I am not really going to put a lot of stock in the results.