By the way, if we compare it to the analogue days: 36 mm x 24 mm film is estimated between 4 and 16 million pixels depending on the type of film used. Source: http://en.wikipedia.org/wiki/Digital_versus_film_photography
At the top end of the estimate, the difference is even smaller.
My partner in Building Panoramics was in at the dawn of digital imaging business so I know a little about this. I haven't looked at the wiki link, but to all intents and purposes 6 to 8 mp is about equivalent to good 35mm film in terms of resolution. You can scan more meg but you end up recording grain.
The 4-16 megapixels are based on findings by Dr. Roger Clark. If you don’t know who that is, please follow the link this time http://www.clarkvision.com/rnc/
Try taking 5 shots at 1/20 on a 35mm focal length hand held with no support. You will inevitably find that one or two frames have IQ damaging blur when viewed at a reasonable enlargement. ( For me it would be four out of five). You may say these are acceptable odds but when that one frame is important it becomes unacceptable.
I didn’t say 1/20, I said 1/40
For (slow) moving subjects like people at a wedding you need at least 1/60 to 1/100
The point I tried to make is that for moving subjects most photographers should be able to get the job done at those shutter speeds with a 35mm lens on a full frame camera without image stabilization. The IS will help a lot if you go down to 1/20 or 1/10 but those shutter speeds will only get you sharp images of non-moving subjects.
Because a f/1.4 lens is a full stop faster than a f/2 lens you can shoot wide open with double the shutter speed or half the iso and that’s a substantial difference in low light situations. That’s why I prefer my 35mm f/1.4 over a f/2 with IS
I read many people on here claiming that the new IS primes are aimed at video, but how many people are 'serious' movie makers wanting these primes compared with the amount of still photographers ?
I can’t speak for other people but I didn’t say the wide angle IS primes are aimed at video, I said “stabilization is nice if you like to shoot video”.
Other than video, image stabilization on wide angle prime lenses will only help you with still images of static subjects at low shutter speeds where you can’t use a tripod.
Where I live the Canon f/2 IS dropped 30% in price after about half a year. Compare that to the 8 year old Canon EF 35mm f/1.4L USM for which you pay about the same as when it hit the market in 2006. To me that says something about the lack of success of the 35 f/2 IS.