Thanks much Knorp !Hi Frederic,
in all honesty it's not bitingly sharp but I like it nonetheless.
If shift is not required you perhaps better look at the Laowa 19mm GFX f/2.8 Zero-D.
From a while back:
All the best.
For some reasons I missed your answer…
I’d prefer a shift lens but have developed a workaround with my GF23 while waiting for the elusive TS30
I simply take a straight shot and a second one, slightly tilted, to grab the top of my subject if necessary. Combining those with photomerge yields better results than my Canon ts24 & 17.
According to your answer I should probably test both the 19 & 20 now.