Well I see all the "Cannon lurkers" have come out to jump on me. Must have hit a sensitive spot there. Especially since my point was simply that a good lens of the right focal length for the shot you want is probably the most important thing you can do to get a great shot.
This is intuitively obvious if you consider the photographer who confronts a sperm whale and calf while they have their 105 macro lens on their camera while on a dive. Thus my interest in noting how good a lens the new Oly would be for wide angle photography. I doubt that the new Oly is significantly superior to my 12-24 and 10.5x dx lenses; but you will note that the one Oly lens will cover the range of both my superb Nikon DX lenses. A CRUCIAL advantage in underwater photography where you can't easily change lenses and your shot may never come back if you don't get it right now.
This was the essence of my original post about the new Oly 7-14 lens. As I further argued I would rather have a relatively inexpensive dSLR and the best possible lens for the job.
That seems obvious to me. If I could afford a D2X to go with that top of the line lens I would get it. But I, like a lot of others can't afford a 4000 to 5000$ camera. Especially if I have to get the newest and greatest camera every two years. However a 1600$ lens is not beyond my desires or finances. Also I can probably use it for 10 to 20 years.
Now to compare the new Oly to a 20D. If you read the dpreview of the camera you will note he says the resolution is almost as good as the 20D. A more expensive camera. Reading the complaints of the reviewer; what he complains about I suspect could be remedied with a firmware update or maybe a little tweaking of the camera. Where I live is the location of the well regarded Brooks Institute of photography. As you can imagine students there are now using dSLRS for some of their work. One of the staff members told me a year or so ago that they had found that the image quality of the 5 mp Oly dSLR was just as good as that of Cannon 60 and 10D and Nikon D100. Makes me think that when this camera is refined it will shoot as well as 300D, 20D, or D70.
Yes, I believe that the above cameras are better for UW use than the top of the line cameras from all manufactures. For one thing they are smaller which can be a priceless advantage when traveling to distant places under potentially difficult conditions. Are you going to leap into a bouncing Zodiac to get that whale shot with with your supercamera? When you might with your 300D or D70? Even if you did can you swim fast enough to get the shot when your camera and housing have twice the mass of the guy with a D70? All your going to get is shots of his (or hopefully her) butt while they get your shot. Even more important. You should never take a camera UW that you would hesitate to leave behind in an emergency. You might think about leaving that 4500$ camera behind just long enough to make your wife a widow. Remember; you don't have to be able to out swim a great white shark. Just your dive buddy.
Second thing is that for most shots I believe all the available dSLRS will give you a good shot. That one from the top of the line cameras will only be marginally better. The quality of the lens and the knowledge of the photographer is still more important than the size of the shooters bankroll. Not as true as with film cameras. However for anything under an extreme enlargement I doubt you will be able to tell much different between shots from consumer versus top of the line pro cameras. I really believe too many of these cameras are being evaluated by engineers obsessed by noise created in their tests and not photographers looking at the final image.
Unless you are making a living off your UW photography I think one would be nuts to take a 5000$ camera UW. There is a decent chance that sooner or later fate will frown on you. Won't happen to you? Of course not. Except that the last 3 people whom I have watched come up with a leaking camera/housing all said in disbelief that it could never happen to them while they were pouring salt water out of their housing. Fortunately only one of these ended up with a ruined camera. Even more fortunate that it was a film camera!
As far as comparing the new Oly 7-14 lens with the Cannon 10-22: a lens I never heard of before. The original Oly 3:4 system seems somewhat over priced to me. That extra 2 or 3 mm of focal length at the wide end my well be worth the extra price.
Any way; enough ranting probably brought on by 2 weeks of continual rain and mud slides. I don't care what you shoot. I haven't found a shot yet I couldn't get with my D100. I would rather shoot with the best lens and not engage in "dSLR envy" over what the next guy is shooting.