The price difference is about the same also, however I would rather compare the Fender to a Toyota instead of a Ford, because Toyota's are dependable and will last for years as will/has Fender guitars.
As been stated in previous threads, for the most part, famous professionals (country, rock, blues) seem to play what they can get their hands on readily... mostly Fenders. Other genres, jazz and gospel in particular, tend to go with boutique/custom basses for a unique genre sound. Most gospel bass players use 5 and 6 stringed instruments and MusicMan basses are very qualified in that area. Although, I wouldn't consider MM a boutique/custom instrument. They are just more expensive than Fenders when purchased new.
I think professionals care about what they play, but I seriously doubt that they pontificate or scrutinize pickups, pots, weight, vintage or a whole host of details like we do here on Talk Bass. It seems to me that TB'ers tend to be fascinated by the instrument. I wonder how well a "Talk SongWriting" website would go over with this crowd?