So as a necessary caveat whenever discussing equivalence, I should say that this is definitely not meant to be taken too seriously, and leaves out some important variables (both tangible and intangible) but I do think it's somewhat interesting nonetheless. So I decided out of curiosity to throw together a chart of the prime lenses in the different mirrorless systems then compare by equivalent aperture and price. After converting to equivalent F-numbers, I transformed those to logarithmic Aperture Values to accurately describe the total light captured [=2*LOG(Fnumber)/LOG(2)]. Then I multiplied that AV by the price in dollars listed on B&H Photo. Lowest number wins. So guess who wins? By a long shot? Samsung. If they have the lenses you're looking for, it's not even close, definitely the best value mirrorless system on the market. Sony's best value lens is (obviously) the 28mm/f2, Fuji's is the 35mm/1.4, and M4/3s is the 20mm/1.7. In general though, M4/3 has better value than Fuji and Sony FE unless you only buy the highest end lenses. Obviously this is just a bit of math, and doesn't take into account the individual merits of the lenses (like field of view, sharpness, bokeh quality, rendering, maximum magnification, OIS, etc...). But it's definitely objective, shows no favours, and is maybe some form of truth. Think of it what you will! I certainly learned something in making it (though having bought the lenses for my girlfriend's Samsung NX210, I already knew they were incredible value). Another obvious thing it teaches you - if you can stop chasing highly marginal improvements in lens speed, even within any given system, you'll save a whole sack of cash. UPDATED: Table below with latest lens additions, color-coded by system. UPDATED: Here's a scatter plot with focal lengths to visualize the data more easily. I've added labels to the plots, and all the macro lenses in the systems for completeness (as well as the Olympus Body Cap Lenses...which are a questionable addition, but apparently still count as good value by this metric due to their extremely low price). UPDATED: And here are the zooms! Possibly the format is a bit confusing, but I think it still showcases the same interesting trends in a fairly intelligible manner.