The Marshall MXL603S is a very good sounding mic and cost a lot less than the C4 will, so for the Studio Projects C4 to "beat the pants off a 603" it is going to have to be one hell of a good sounding mic. After you post your review on the C4, I sure hope you send Harvey a free C4 and he does a 603/C4 shoot out review. And of course we know which mic's Harvey likes by looking at his equipment list.
Have a nice time in Japan and thank you for the C4 comment, I'm looking forward to your C4 review.