But now I see that many of you nikonians thinks like "meh... okey,
now canon have made 40D to ALMOST stand up to the D200" etc. and I
don't quite get this. Is this only fan-boy talk or have I missed
something in the performance of the D200?
Define "performance."
One of the problems with digital photography is the ease at which you can open a file, zoom to 100%, compare files from two competing cameras, and think you have a great understanding of the tradeoffs involved in those cameras. It's obvious, right? More megapixels = best, and noise = icky. So, you end up looking for maximum megapixels and no noise at speeds up to and beyond 3200 ASA because anything less is "unprofessional" (insert your term of choice here) and you never get off the upgrade treadmill. Every 12 months you'll
need to buy a new camera because it's "better" when you open a file to 100% in Photoshop and compare it to what's coming out of your current camera. Clearly your current camera is now obsolete, its images are now unacceptable, and you need to eBay it to some sucker ASAP so you can get the camera that you
really need - you know, the one that will actually improve your photography. The one with all the magic in it.
Unfortunately such a camera doesn't exist.
Now, back to your questions...
Shouldn't the 40D clearly outperform the D200 in almost everything,
exept maybe construction and ergonomy?
Well, the Canons generally have less high-ISO noise, and a touch more megapixels (haven't kept up with the newest announcements, so I can't reply more accurately than that.) There's a cost though: less dynamic range, lower build quality and higher failure rates, more expensive lenses (also apparently with build quality issues), poorer focusing in low light (something you'd think they would do better given their low light sensor performance), and a flash system that many think doesn't compare to Nikon's iTTL.
Hell, most Canon shooters I've talked to shoot on center-weighted metering and compensate manually for exposure, because the evaluative is so unreliable. Matrix, at least for me, just
works the vast majority of the time.
And oh, I'd prefer not to get answers by neither canon or nikon
fan-boys, I'm sick of you...
Well, I shoot with Fuji.
My perspective is as one who's been shooting film for a while, and who spent years in the darkroom. I've got around 30 images in the other room (I'm hiding from them as I need a break from framing) that are all printed at sizes from 16x16 all the way up to 30x40. Some were shot on 645 (medium format), some with 35mm, and a couple with a lowly 6 megapixel Fujifilm DSLR.
In all cases, the deciding factor in deciding which image is "best" is the image itself: lighting, composition, whether "the moment" I was looking for is there, and so on. Photography trumps equipment.
Beyond that, to my eye (and my wife's) the 6 megapixel trumps the 35mm, and the 645 trumps the digital (though the 645 shows more grain -- after all it was shot on "real" B&W film) primarily due to resolution. The 35mm looks great at 20x24 inches (the largest I chose to print from it, though I've sold 30x40's from 35mm that thrilled clients).
So let's assume that any DSLR can produce better quality than 35mm assuming you know what you're doing. That said, what kind of performance are you looking for? If it's everyday shooting and you're not making large prints then I'd say my "lowly" 6 megapixel camera has it all over Canon or Nikon due to its ability to capture a greater range of tones. And that goes double if you're shooting photos of people (and I'm a people photographer -- that's why I shoot Fuji). If you want to make large prints of landscapes then odds are eventually you'll have enough sense to shoot in optimal lighting so DR isn't as important, and overall resolution becomes more important. But even there, you're looking at minor differences that likely don't matter -- Galen Rowell was selling 40x60 inch prints from 35mm after a touch of digital processing for huge amounts of money. You can make the argument that 35mm is more than good enough, and if so, any camera you decide to choose will likely be more than good enough.
The rest is nitpickyness. If you're not printing above 16x20 then you won't notice it. Even then you'll likely only ever notice it if you've got 2 shots to compare, and in all cases
all of the options are likely good enough assuming you can capture a worthy image.
Those who disagree with this sentiment are generally those who wouldn't accept any landscape shot on smaller than 4x5 film, and nowadays they're leaning toward medium format capture. IMHO they're too caught up in the technical details, but I don't want to fight over it. After all, I'm a people photographer.
--
Derek