*****
I have to disagree. IMO, the D300 is *almost* eye to eye with the 1dmkIII....yet the D300 costs $1800.!!!! Ok...the 1dmkIII has a little better body build quality...and 10fps vs 8. Is that worth $2700 to you?
Btw, to other posters, I also don't agree with saying the 1dmkIII can't focus....yes, it has some issues in some circumstances, but.....let's not get carried away.
The 1ds mkIII *is* king....at least for now. "Those in the know" have made it pretty clear Nikon is releasing it's competitor to the 1dsmkIII the middle of next year. I never intend to spend $8000 for a body...Nikon or Canon...pretty small market.
The Mark III's AF problems stem from its inability to focus in high contrast, bright and sunny days. Where AF should shine on any type of camera. Read Rob Galbraith's review for more info and a pro Canon shooter's opinion.
As for the Mark III being on top, that is far from the truth. If the IQ of the D3 proves itself worthy, and matches or supercedes the Mark III, then the D3 will have it beat in all arena's sans frame rate. The Mark III would have 10fps, while the D3 has 9, and I would spend the extra $500 for an FX camera that did 9fps rather than have a 1.3x crop, 10mp, and 10fps. That's just the truth.
p.s. The D300 going up against the Mark III is like the D200 going against the 5D. It works... but I know Nikon never intended to go toe to toe with Canon, and they did a great job cutting them off at the knees, and offering users better features at lower prices, with the loss of IQ.
Not to mention the 5D which I find very hard to justify over a 40D which is faster, of the same built quality and a lot, lot, lot cheaper. Not to mention the comparison with the D300/D200. The 5D doesn't even have environmental seals (which the 40D, D200 and D300 have)!
I also think that the pricing/feature strategy corresponds to the traditional `zig-zag': 400D < D80 < 40D < D300 < 5 D < D3 < 1D Mark III < 1 Ds Mark III.
I agree with you, but there are just those photogs that need that superior IQ once they get over ISO640. As for the D3 being under the 1D Mark III --> it ain't happening. I know that no matter which high end system I put my money with, the D3 is hands over foot better and a bit more practical than the Mark III. Right now, the only thing holding the body up is its proven IQ. Once we see samples from the D3 at ISO 800 --> 25600 we can judge which camera may be worth the $5000 these companies are asking for.
All products experience diminishing returns as they get more expensive. This is why they are usually not worth it to most people, but easily worth it to some.
In my circumstances, for instance, I doubt I would consider the $500 premium for the D300 over the 40D worth it, especially as Nikon glass is almost always more expensive than Canon glass for similarly spec'ed lenses:
85mm f/1.8 (Nikon $390 Canon $340)
35mm f/2.0 ($320, $230)
20mm f/1.8 ($490, $420)
135mm f/2.0 ($1080, $900)
300mm f/2.8 VR/IS ($4500, $3900)
24-70 f/2.8 ($~1700, $1140)
17-35 f/2.8 / 16-35 f/2.8 ($1500, $1370)
12-24 f/4 / 10-22 f/3.5-4.5 ($910, $690)
You do save with Nikon on the 70-200 range though, although Canon has more offerings.
As many other photogs say, it depends on what you need. There are plenty who spent $1500 more on the 5D rather than pick up the D200, for only the IQ, which is only worlds better than the D200 above ISO 640. To some that is worth it, to some it isn't. After going to spend $3900 on a lens, $600 shouldn't be a problem, if it is, then that photog has to work out their budgeting problems.
And Canon's glass may be cheaper, but their bodies are a tad expensive, and don't offer as much as the rest of the market in some minor instances. The Pentax K10D offered similar specs as the 30D sans the frame rate. IQ was on par up to ISO640, and the K10D offered a much more advanced battery grip and better weather sealed body.
You give and take no matter which system you go with.