I have used my MT26 in PMA11 a fair bit while renovating my new apartment alongside my Enzo Trapper in Elmax (the Trapper have done some of the worst jobs, including downright abuse). I have gotten some chipping in the PMA11 edge when cutting plywood and trimming laminate floors (got it with the Elmax blade as well), very small chippings I might add, each one less then 0,5mm, maybe even less then half that. Cutting lots of cardboard on the other hand did little to dull the blade, and I can get it really sharp without too much effort, getting rid of the chipping did take some work, but nothing unreasonable.
I have also gotten a minor dot of staining near the tip of the blade, small and superficial, but not easy to get rid of.