[dave9t5]

The lens is very large because the lens designers of the mirrorless companies are less skilled, and the companies perform serious price gouging because the market for the non-kit lenses is mostly wealthier amateur users.  They charge such a crazy amount for a mere 300/4 because people will buy it for that.

@AiryDiscus:

Please rank the lens design ability of each lens/camera company from high to low!  Thanks.