This is one of the few gear threads that I have enjoyed reading through. Several very good points.
@kenoh I loved your initial post though have one major quibble (which was brought up in subsequent comments): you have produced numerous images that I would be quite happy to hang on my wall (assuming I had taken them
).
Successful images depend on: (1) subject, (2) composition, (3) light, (4) choice of exposure, (5) timing, (6) technique, (7) random filler comment to extend the list, (8) gear. There are times where gear moves higher on the list (some subjects can only be captured with specific gear). In fact there are whole types/subgroups of photography that are very gear-dependent. But it often isn't the most important factor. Knowing how to use the gear you have is an entirely different matter and is vastly important....
One thing that hasn't been mentioned in the thread thus far is intended output for your images. What are you planning on doing with your images and how do you intend to display/share them? It can be wonderful to view an image at 100% in LR and have the subject sharp (like *really* sharp*). But is that going to translate to your intended output? Likely won't be evident in email size pics, web pics (like here on MR), or even small prints (say 8x10 or smaller to set an arbitrary cutoff). Printing big it certainly can matter, but are you going to be doing that?
The other time that larger files and sharp lenses matter relates to how often you need to crop your images and how severe the crops are. In that case starting with a larger file and a sharper image will result in a meaningful improvement in the quality of the final image, regardless of what you do with it.
Lots of good options out there regarding bodies and lenses. Needs and budgets differ.
I would throw out a plug for a body with a tilt-able rear view screen. That one little gadget has proven to be transformative for me in many situations. It opens up composition choices that are really not there with any camera that lacks this feature. Even if shooting on a tripod and not hand-held it is an awesome feature.