Whereas I agree with the general theme of it being about the photographer and not the tool......and that we often put way too much stock in the differences between cameras.....I also think it's easy to go too far the other way as well.
Of course the tool is important. If you do any job, you want the right tool. And a good photo is a marriage of a photographer's understanding of the things mentioned before about composition, utilizing light, etc. But, it's also about an understanding of what tool you are using to achieve the results you need. There might be workarounds to compensate.....and one can still take a great photo within a certain framework of features and quality of the camera......but there is also something to be said for having certain advantages. Even if it doesn't make it impossible to shoot a particular scene with a lesser camera, it might make it difficult to achieve the same result. If that weren't true, why don't we all go buy the cheapest point and shoot, do all the workarounds, and see if it stacks up accordingly with varying degrees improvement with sensors, features, lenses, etc.? That's why they make better cameras/lenses to help make someone who understands all the other things necessary to make a good photo.....to achieve an even better result.
For example, I couldn't even begin to take the kinds of shots of my son playing soccer that I wanted to take with my older model *istDL.....with the lenses I had at my disposal (Pentax kit lenses, cheaper third party stuff). But was able to when I got the K-r. Same lenses, but with the huge improvement with high ISO noise I was able to crank up the ISO to still be able to freeze the action in lower light. And not just the high ISO, but the big difference in auto focus speed and accuracy.....as well as the 6 fps for capturing a nice sequence of shots together. The K-r allowed me to capture the shots I wanted just by virtue of upgrading cameras....or, if you will.....the tool. Even if I had bought a more expensive 2.8 lens so that I could keep the ISO lower....I would have still struggled to get certain shots because of in camera differences with auto focus and overall response. The K5 would have done even better I am sure.
This is just one example. There are other things like dynamic range (and the accompanying highlight and shadow correction options), as the OP pointed out, that for me have made a big difference in capturing landscape shots with various light challenges. Even if you use filters and/or post processing to help mitigate those differences (workarounds), there is a substantial amount of time and effort to utilize those things properly......and they still can't always produce consistent results in the same way as just having that extra range built into the camera.
So when it was stated that if you can't take good pictures....don't blame it on the equipment....that is only true up to a point. In the example I mentioned, the equipment is what made it work for me. And somebody mentioned stabilization and used tripod as a good example. I agree. However, using a tripod isn't very practical for shooting soccer. Though I did it and did get some good shots, having image stabilization in the camera allowed me to use a monopod which is much easier to use. Again, a benefit of the tool.
My point is simple. The most important part of taking good pictures is indeed knowing all of the other elements beyond what a camera does or doesn't do. That is not what I'm questioning. But don't sell short the benefits of using a tool that has upgraded features. Even if it's just to make things that were possible.....but cumbersome before......and make them much easier (think of a hammer vs a nail gun.
) and allow more time to do other things (whether it's taking more shots or doing something completely unrelated to photography).
Finally, I would also disagree with the comment about nobody caring about the comparison of the two cameras. I do. I like comparing features. I like seeing the distinctions and which "tool" might be best suited for my needs. I recognize that there are a lot of similarities between cameras made in the same era, but there are still enough nuances that are different. Weather sealing for example. That's also a big part of the tool. There might be workarounds for that too.....but if you were wanting/needing to take photos in different kinds of weather conditions, it would be nice to not have to worry about it.