I think you could also say how well designed, both ergonomically and technologically, the C300 is, that even after 3 years of being on the market it still sells/rents so well. As a corporate video pro the C300 is my preferred camera for shoots. I can shoot outside in bright daylight, inside in a dimly lit environments with minimal extra gear (rigs, recorders, XLR packs, screens, etc.). Everything I need to pull of a quick shot is onboard the C300 from Day 1. Even today in the growing world of 4k this and 4k that, the C300 still creates a crisp 1080p image that I turn to time and again for my day-to-day work.
That said, there are more and more cameras that are starting to look appealing to me (none of which are DSLR based cameras). Specifically, the Sony FS7, when it ships, looks like another winner for cinema, corporate, or event shooters. The XAVC codec continues to get praise from every corner of the industry. Sony may have finally produced a camera "for the rest of us" in the FS7 for around $8K according to pre-order pages.