Hello again, Mr. Mitin,
Still I think measureable statistics are very helpful in understanding the differences between steels and knives. One can find good and bad opinions of every steel on these forums, and sometimes the reason for these opinions are not clearly stated. If one says "I prefer steel A to steel B because A has 20 percent better edge retention", that is a better explaination that simply saying "A has better edge retention than B". In the second case it is not known if the edge retention is one percent better or 100 percent better, yet the degree of improvement is very important.
Of course, I understand that other factors such as heat treatment and edge geometry are equally as important as which steel is used.