As per the brochure from my friendly parts supplier shows that the K battery have higher Reserve capacity of about 20-30 Ah as compared to the "leading" brand motolite of the same size (ex. K battery 2sm 90 Ah vs. motolite 2sm 70 Ah). one thing i haven't seen on the brochure is the cold cranking amperes.
price is competetive or could be higher by about P200-300.