If the 100/2.8 Macro is your benchmark, then there’s a limit to the number of lenses that perform similarly well across the field of view at all aperture settings and distances. The D FA50/2.8 (or any of its predecessors with the same optical formula) and the DA35/2.8 Macro Limited come to mind, though there’s also some older exotica that are highly regarded, like the FA*200/4 Macro (good luck in finding one of those, letting alone affording it).
The FA43/1.9 Limited is sharp, and, as a general-use lens on the K-1, it’s remarkably useful. Similarly, its fellows the FA31/1.8 Limited and FA77/1.8 Limited are likewise, within the limitations of their respective focal lengths. However, they aren’t sharp across the field of view at wider aperture settings, and quite deliberately so. Somewhere here there’s an article on the philosophy behind their optical design, but I can’t lay my hand directly to it.
Staying with older lens designs for a while, the other FA* lenses are well-regarded for sharpness, including the zooms, such as the FA*28-70/2.8 and the FA*80-200/2.8. An exception is the FA*24/2, which isn’t noted for sharpness (though it’s still pretty good) but for contrast and colouring. The longer zooms and unifocal lenses are exotica, and priced accordingly, but I have no personal experience of them, whereas I do own the others above, except for the FA*200/4 Macro.
Seeing you have an APS-C camera, there are, of course, the DA* lenses, although the DA*16-50/2.8 is frequently derided for not being always sharp. Its companion zoom, the DA*50-135/2.8 is conversely highly praised. I have both those lenses, and enjoy them both on my K-3.
If you have no need for a longer focal length, my suggestion would be to try the DA35/2.8 Macro Limited, as it’s a very useful focal length for general work, and it’s a very capable macro lens.
Originally posted by Docrwm Nice to see you here again, Robert.