Hi Soren,
I'm also about to buy a new set, so after Drew's 'food for though' I contacted Aquatica and some photo / video pro’s for their opinion. Like you, before spending a bundle It is good to have done your homework!
This is what they say:
The CanonXF105, it is a very good camera, but difficult compare to the Sony FS100, since it has a much smaller sensor and fixed lens. As for the CODEC, it is a 4:2:2 MPEG2 @ 50mbps wrap into MXF file wrapper. The 4:2:2 might offer some advantage in multi-generation color reproduction, but the MPEG2 encoder is not as good as the AVCHD used by the Sony FS100, when there is a lot of motion in the picture. Were talking underwater video here so that means a lot of 'motion'!
The Nikon D800, is a very competitive solution, but use the right tool for the job, so all video guys would at this stage go for something like the FS100. It is a better choice as an all round video camera and will do the job under all conditions, Sony had as a long tradition of providing video cameras and have all the features required for almost all conditions of video shooting. A very responsive auto focus, WB selection and processing, better audio support, time code, etc.
The D800 will perform very well, in most conditions but ergonomic, and “live” video acquisition needs more attention.
Now the main difference for all those cameras is the 1080p60. One of them didn't like the 24P and 30p. Sometimes it works out because of the progressive scanning, but with fish and underwater creatures you may have a lot of judder. The 1080p60, provided by the FS100 gives a much crisper and clearer image, with a very fluid movement, it is not used for overcranking (slow motion), but because of the progressive frame. One of them used to shoot 1080i60 for long time, but will never do this again because of the availability of 1080P60. Note that some major film maker (James Cameron, and others) have already announced that their next film will be using an higher frame rate such as 48p or more. SMPTE is currently working in higher frame rate standard for film.
As for the lens issue, the Sony e-mount system is a very young system, already a lot of native lenses for various applications has been announced by Sony and others like Zeiss. Not all required lenses do exist but will be available over time.
In the case of the Genesis, adapters might be used, but will limit the use of the lens as for the aperture, and mechanical focus, Aquatica says it is in a “listen” mode” as for what will be required in the future.
Macro: Drew is right, the lager sensor (~35mm) and a 30mm macro lenses give near to 1:1 ratio, so a critter having a size of 5cm (~2”)
will almost fill the screen. Aquatica did test dives with the macro port, and they found out this is a bit limiting, but as soon as some equivalent lenses of 60mm or 105mm will become available in the future, or use them with an adapter ring, this problem is solved.
I have just repaired my 'old' EVO Pro, but hope to upgrade a.s.a.p. The problem is, there is a gap between big heavy pro cameras and small recreational cameras with housing. I hate those big bulky cameras and I'm a video guy, so for me there is no other option than the new Genesis.
Hope this is of any help.
Bon weekent as we say on Bonaire!
(Thnx to my Dutch video friend and Amphibico / Aquatica for taking the time to answer all my questions!)