Country: Iceland
The comparison with La Liga isn't really relevant because it is widely considered to be a league with less competition from lower teams, and less physically demanding.
If you look at www.whoscored.com, you'll see that Sanchez's combined minutes across League and Champions league this season is more than any of those 8 players. The Chelsea and Liverpool players get a rest midweek when Arsenal play in the Champions League.
Pretty stupid choice of players to compare.
It still means these players are playing the important games. When fit last season how often did Hazard and Costa get rest? More than Sanchez? Or when Chelsea won the league?
We have rested Sanchez in games where we could have afford too.