It seems odd that, one of the first scales you ever learn on the piano, C major, is one of the last ones you learn on the violin. After attempting three octaves of it,  I can see why though. I must admit to being constantly amazed how close the fingers can be to the bridge and yet still produce a discernable note! Definitely a case where not having frets has its advantages. Strangely, B major is easier on the violin than C! I think sharp keys are easier in general than flat keys.