This week could prove just how good the New England Patriots and Buffalo Bills really are

Only four weeks remain in the 2019 NFL regular season, and Sunday's slate of games is a doozy.

It'll be a particularly telling week for the AFC East, where the New England Patriots might actually have a real challenger for the division crown for the first time in what seems like forever – and people are excited.

New England, behind quarterback Tom Brady and head coach Bill Belichik, has won the last 10 division titles, but the upstart 9-3 Buffalo Bills, who were mostly an afterthought before the season, are right there.

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Here's the thing, though: Neither team has done much against quality opponents this year, aside from New England's hardfought 16-10 victory in Buffalo way back in Week 3. New England is 10-2, but they were beat convincingly in their two most challenging games this year — road matchups with the Baltimore Ravens and Houston Texans — which has led to questions about whether the Brady-Belichik partnership might be winding down.

Buffalo, meanwhile, has only beat one team that currently has a winning record, and it's fair to say that the Tennessee Titans were nowhere near as good as they are now when that happened.

Both teams will be up against a major test Sunday with a chance to buck the trend. New England will host the Kansas City Chiefs and reigning MVP quarterback Patrick Mahomes, while the Bills have the luxury of playing the Baltimore Ravens, the hottest team in the league thanks to potential 2019 MVP quarterback Lamar Jackson. Per The Ringer, New England will need its statistically-impressive defense to play like it has against its non-Houston and Baltimore opponents, while Buffalo will need its improving quarterback Josh Allen to step up against Jackson.