The images are in diferent situations of tenion of the muscles so it's difficult to use them like an example but I can tell - Yes - he worked over this in the off season.
When I sow him at the Abu dabi exo I saw Roger got stroger - arms and legs, expetially biceps and quadriceps. Notice the double muscle over the knee (at the serve returning) that before wasn't so marqued.
I saw him in past images strong as now so I don't know if he's going to mantain that muscles untill the end of the season or will lose something in the months.
PS: As I play I do a x-ray of the players and as I observe Roger better (I wonder why?)
it's easier for me notice the differences.