He wants to know how the mobile IPS DISPLAY compares to external DISPLAYS of similar type. He wants to know the quality difference between the TWO.
Sigh. Go back to the beginning.
He asked what
kind of IPS display is in the MacBook, because he believed there was an inherent quality difference based on bad information he received elsewhere, so that he could
use that information to compare external monitors.
You sent him to some websites that do a general baseline comparison of various monitors, which has nothing to do with his original question, and without much more context than you provided, has nothing to do with his followup question, either.
The review sites will help him pick an external monitor and will, to a much more limited extent, give him some information on how the retina display performs compared to desktop monitors. It will not tell him whether there's a difference between IPS subtypes (the idea underlying his original question) and it will not tell him directly "how good" it is in comparison to "external IPS" displays (his followup). It also will not explain what "normal IPS" is (not that there even is such a thing).
Clearly, if he's aware that there are different branches of IPS technology, he's aware of the existence of online product reviews and was asking for something more than a dismissive link to reviews that aren't even sorted by panel type or relationship. Taken together, he was asking whether the observed benchmarks are caused by the IPS subtype more than other factors and the answer is no. And to top off the unhelpful reply, you're rude to boot.
It is also helpful to comprehend written text enough to understand what information a poster is actually looking for.
If only.