So I've bitten the bullet and gone and bought myself a new camera. After testing out the FS100, F3 and C300 I'd decided on the latter. I'm not going to go into detail about spec comparisons and whether or not the camera can do a million frames per second at 4k resolution. Just let me tell you this, the HD image's this camera produces are stunning and that's what counts. The rest is down to the filmmaker.