Your examples of models are pretty wide spread in displacement, age and power output, as well as purpose. They may run similar RPM, but behavior in the cut is going to vary greatly, the majority of users will notice the difference in actual power output moreso than peak rpm.
Then there is the 133 chassis, all small displacement high rpm screamers, very much niche market saws designed for pulpwood production, where limbing, rather than falling made up most of your day and you weren't often dealing with trees more than 16-18" on the stump. I am probably only half as effective with the 242 as my dad was, but, for the right job it is untouchable, those extra thousands of rpm are noticeable when you are turning spruce/pine/fir into 8' blocks for the forwarder to pick up, but, some people buy them because of the hype and peak rpm thinking they are some kind of monster and end up disappointed, because they are using them for the wrong purpose.