Two things heavily influenced us on exterior color:
a) What colors the heavy black trim looked best against
b) What exterior color would be OK with black interior since gray isn't an option (we're too messy to go tan...lived and learned).
Loved the darker blue, but not with the black trim...and not with black interior
Loved the black, but our past three auto purchases have been black...and black on black just seemed overdone
In the end, we went with white with black leather. For us, it feels fresh yet timeless. But to each his own.
I'd like to know the median age of CX-5 buyers. I can't imagine the 35+ would be scooping up cartoon blue -- unless you're sure you're trading in a year or two. Remember the teal craze? Then the color that looked like melted orange popcicles? Brown looked like it was going to be a hit for a minute, but then faded.
If I controlled colors at Mazda, I'd offer a special edition dark blue exterior with white leather(I wouldn't dare get it, but it would look great)....