Hi, I am the author of the comparison tests posted in Flickr for Pentax K5, Canon 5DII and 550D.
The purpose of this test, as explained in the roll-on appearing menu, is not to determine which of the 2 cameras offer higher resolution in normal conditions, but only to show the dynamic capability.
In that test I have used the 200 ISO setting only using the over-under exposition stress metodology that says more than a thousand words.
A camera with such a large dynamic range can be useful to everyone not just those who photograph landscapes! Here Pentax K5 at today win by a wide margin over all currently on the market, except the Nikon D7000 we probably could put in second place, but very close to the K5.
The Canon 5DII, with good lenses, I am almost sure, offer more detailed images, and so, no surprise here.
----------------------------------------------------------------------------------------
I make large panoramic images, everyone can take a look at
Claudio Costerni Now, also with Gigapixel resolution coming from hundreds of stitched pics and so the small difference in resolution, for me, is not the more important thing.
And anyway even less large images, almost always, come from the composition of multiple images, even just a dozen and have a detailed poster resolution.
In other pages, there in Flickr, I have posted also a comparison between the K5 and Canon 550D, please go to see it, but the results are similar.
One page is this, but there are also other ones:
Pentax K5 vs Canon 550D - Collage 02 | Flickr - Photo Sharing!
In my opinion the nice K5 miss at least 3 important things to be almost a perfect photographic tool:
1. Live view with an effective resolution, the resolution in pixels that stated by the manufacturer.
It is very difficult to focus precisely because the close view with the zoom function does not show all the points of the sensor, it is like an interpolation apparence, a preview that makes the point of focus very uncertain because of the confused details.
The recent Canon, Nikon, Sony and Panasonic are a lot better here.
2. Greater speed in responding to some menu commands.
For example, there is an annoying delay between pressing the buttons to select-confirm-delete the photo and the actual completion of each step.
You always have the temptation to re-press certain commands because they are too out of sync with representation/execution on the menu screen.
On the other hand has an excellent capacity for continuous shooting with a very large buffer memory and, with faster memory cards as SanDisk Extreme 30MB/s, a very good recording speed.
3. Last thing, the K5 is not stellar of ergonomic, as someone say.
The buttons are too small for a camera designed for use even in difficult conditions.
With cold fingers that become insensitive or worse with, even light gloves the use becomes very uncertain and uncomfortable.
The small jack port for remote control is placed on the right, next to the rubber handle: absolutely wrong, stupid position.
For those who want to leave the wireless receiver on the slide of the flash and connected with the cable to the camera remote port, has to endure discomfort in the handle with the protrusion of the connector: this is absurd!
Best Regards ,
Claudio