Cax: Which is cheaper, a $900 lens with a $400 camera body, or a $400 lens with a $3000 camera body? And what retains its value better?
A 75/1.8 is equivalent to a 150/3.5 in photographic terms, but it severely outperforms it in one aspect: Rendering the image on 1/4 of the area and 4 times brighter means you can use a smaller and cheaper camera. The lens itself will also be smaller. This has always been the strength of the 4/3 system. It was true for an E-520 with the 50/2 macro, and it is true for µ4/3 today.
You can buy a 150/2 for Canon EF, but you can not buy a 75/1 for µ4/3. That is the strength of the Canon EF system.
Choose the strength that fits your needs better. It is as easy as that.
Why did I waste my time reading that? Error upon error...