IMO, the mk41 is a better supercard cap for ambient recording. It has better side/rear rejection and a more neutral sound and better HF extension. I believe the mk41v has a very slight HF bump compared to the mk41, but its not as significant as the mk4v/mk4. The mk41v is easier to use undercover, so for that application it has superior form, but inferior function.
That said, they both sound great and I'd love to own either.