Anepo: I really want one but then again I also want the 20mm 1,7 & 45mm 1.8 along with pana 100-300 and olympus 9-18mm
However the price alone of these lenses makes it unrealistic for me to afford the 75mm and 100-300mm. Being Unemployed is not exactly a very profitable career, Especially since in my country photography is protected under law as a profession that you must have gone through years of studying to be allowed to work in the field.
The perfect portrait lens, like all things in photography, is dependent on you and your specific needs. One man's perfect lens may not work for another.
The suggestion of portrait FL between 50mm - 135mm refers to the FF equivalent and depends entirely on how you most often shoot portraits (head shots, head and shoulders only, full body, etc.) and what size imaging sensor you are using.
If you have more room to shoot and are on a m43 body, then a 75mm FL may work best for you. While 85mm on an APS-C may be best for another. FYI, 75mm m43=150mm FF; 85mm APS-C= 136mm FF.
The bottom line is to get out there and experiment with different FLs and find what works best for YOU.
Disclosure: 50mm on APS-C or 85mm FF is my personal choice. You are reasonably close to your subject without the distortion of bodily features that you get with lower FLs.