IMHO the Pardini K12 and Pardini K12 Junior have got the best engineered and the best "feeling" trigger of any of the match air pistols that have mechanical triggers.
I do not remember too much about the K58 as I didnt keep it that long, but my Pardini P10 SSP has been with me a long time, and that has got a fairly good trigger - maybe not so different to the K58.