Yeah, I knew that, Keith, and I expect to hear about all the diffraction problems associated with f/22. Yesterday I went out and shot a whole series of HDRs at f/22. Here's one of them. Golly -- yes, visible softness from diffraction if you go to 100% with one of the nine 36 mpx D800 frames. But even a tiny bit of sharpening takes care of that. It's not a great shot -- just testing the latest Photomatix, which turns out to be pretty good.
The image looks OK on screen, but has a resolution of only 1440 x 961 pixels and appears somewhat flat with no "pop". It is difficult to judge the sharpness of an 36 MP image with a 4 MP screen preview. A quick application of Topaz Clarity Landscape Pop II does wonders with this image, IMHO. As is, the image you posted could make a decent 4 x 6 inch print.
I don't know what the image looked like before you tone mapped it, but the contrast does not appear that high and you might get better results shooting at f/8 and focus stacking with Helicon Focus rather than trying HDR.
Sharpening (especially with deconvolution algorithms) can improve contrast lost to diffraction at lower spatial frequencies, but high frequency detail may be reproduced at such low contrast that there is nothing for sharpening to work on. To illustrate, here is Bart's resolution target shot at f/22 with the D800e and Zeiss 135 mm Apo. The Nyquist frequency of the sensor is shown by the black circle. The limit of resolution in the image is shown by the white circle:
Sharpening with Focus Magic (a well regarded deconvolution algorithm) improves contrast at lower frequencies but does nothing near Nyquist.
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And finally, here is the image at f/4 with Focus Magic sharpening.
Which do you prefer? F/22 does reduce aliasing, but it is not bothersome in most landscape images.
Regards,
Bill
