Olympus 40-150 + MC20 or Olympus 300

By popular request, well a couple of people asked, I thought I would attempt to answer a question that I quite often see discussed online that is “How much better is the image quality from the Olympus M Zuiko 300mm f/4 Pro than the Olympus M Zuiko 4-150mm f/2.8 Pro with the MC20 2x teleconverter ?”

Olympus 300 + MC14 or Pana-Leica 100-400 ?

Following on from my post yesterday regarding getting extra reach out the excellent Olympus M Zuiko 300m f/4 Pro lens where I concluded that the MC14 and MC20 teleconverters do produce better image quality than simply cropping the image in post production, I thought it would be useful to look at the fifth option for getting extra reach namely not using the 300mm at all but replacing it with something longer.