Soft-shooting .40's:
Beretta full-size, especially with the Brigadier slide.
Full-size/Longslide Glocks, especially the C-models.
Stainless-slide SIG P-226's.
All-stainless *&* 4006/4046.
CZ and clones in .40.
Generally, any full-size service pistol in the caliber, especially those with double column mags (wide backstraps spread the recoil) will be softest-shooting.
Course, I think the midsizes (G23/P-229/XD-40/P99/etc) are pretty soft-shooting, too.