2.3 kg compared to FS5 827.8 g......not including lens....no matter how good the image is, it is simply too heavy for events and run & gun documentary kinds of shoots....There are many critics when C100 first came out. Many people complain about the lousy specs but I see the potential of this cam for weddings, events and non high level commercial shoots, thus I bought it and simply love it. It simply works with excellent ergonomic and I've been using it for 3 years and never regret buying it. I've gotten myself a A7s and although the image is much much sharper and detailed compared to c100, I still prefer the C100 as the ultimate run & gun cam. The only thing that's holding me from upgrading to C100 Mk2 is the lack of 4K and higher frame rate which is much needed for me. With the announcement of FS5, it has won me over with the same excellent ergonomics as c100 and good specs. Ultimately all I want from a cam is it to work out of the box, highly portable and good ergonomic. Whether its 420 or 422, 8 or 10 bits doesn't matter to me because all my clients are layman and can't tell the difference and IMO, most modern cam have excellent image quality.