I haven't experimented much with headphones for the past six years, since buying a pair of in-ear Shures, which cost about £150 (about same as the C5s now), but the difference between them is staggering - the C5s give a much better, involving sound. Certainly not light on bass, they create an excellent soundstage for vocals, acoustic strings etc.
I've been listening to the Lia Ices "Grown Unknown" album, which I also have on vinyl, and the C5s give an excellent sound. This album is a good mix of bass, acoustic guitar and female vocals, and sounds extremely good through the C5s. If you like the sound of B&W speakers, you'll like these.