Thank you all for information and feedback. It seems that there is not one clear must have choice in this area. To be honest a zoom would probably be most sensible choice. FA20-35 or DFA15-30 would cover the wide end with great sharpness. However, I'm looking for a passionate, not sensible, solution, so no zoom for me at the moment. Even AF lens is pushing limits of my comfort zone
Based on shots I have seen there are some characteristics in FA*24 that I really like and I think that I could live with the weak points of that lens. Apparently I wont know how it fits into my style until I buy one and test it myself. But at least I have confirmed that price in local shop is too high and wont pay that much.
I've also come to conclusion that 24 doesn't necessary compete with 20. Style and rendition of M20 is so different from FA*24 that I might be able to justify both, but the question mark about it's sharpness remains. I guess this is also an issue that I wont know until I try. This lens seem so hard to find that even I should be able to sell it quite easily, if I decide not to keep it, so there should not be much risk in trying it. FA20 is closer in style and price to FA*24. Corner to corner it looks better, but starbursts turn this into favor of 24.
I put my DA18-135 on sale to raise funds for FA*24, but I'm pulling it out. I have gone thru a lot of my shots with that lens and, thanks to Normhead, I've decided that I need to give it a new try before I can sell it in order to avoid a mistake. It seems that my frustration with that lens has been due to my inability to use it to its strengths. I've learned a lot about photography since I last used it. It shall remain my WR option for occasions when that is needed.