The picture below is making its way around the internet. I wish I could credit whoever put this together, but it's been reposted so often I have no idea where it originated. In any case, it offers a great visual comparison of two very similar catches that resulted in very different calls.
Fitzgerald's catch caused a digital tidal wave on social media when Cowboys fans and others began openly questioning whether the NFL has any clue what it's doing. That wave of outrage is neatly summarized in the two following articles:
Even Mike McCarthy, whose team benefited from the Bryant non-catch, and now came up on the short end of the stick on Fitzgerald's catch, is baffled about what a catch is in the NFL.
Mike McCarthey doesn't know what the hell a catch is either pic.twitter.com/p44apEcSdr— Will Brinson (@WillBrinson) January 17, 2016
Plus they got the coin unflip.