Schofield started 12 of the 15 games he played for the Chargers last season. He has made 81 starts overall since entering the league as a 2014 third-round pick of the Broncos.
I think most will agree that he will clearly be an upgrade from what the Bears currently have on the roster. Well, you could make a case that he is also an upgrade from what the Bears had last year. Check out this statistic comparison between Schofield and last year's Bears' guard James Daniels, who signed a pretty hefty 3-year contract with the Steelers.