I prefer the RA over the C10. RA are warmer but have a more natural timbre than C10, as well, even if less V shape the C10 vocal sound dryier IMO And, hum, lets not talk about construction as RA is unbeatable. C10 is little more detailed and have slightly better imaging.
Headphone Reviews and Discussion - Head-Fi.org
How this vs the cca c10?