Before I suggest you anything, I'd like to thank you for all your work, there's no site I trust more than yours when it comes to lens reviews, ever since I got my first DSLR (a Sony Alpha 200) you've helped me decide what is worth my hard earned money and what isn't.
There're only two things that I think you should add to further improve the utility of your reviews:
1. How effective optical stabilization is
2. Light transmission (t-stop)
I think the second point is really important, sometimes the difference is a full stop. Also, it seems relatively easy to test.
Many probably buy wider aperture lenses with the explicit intention of reducing noise or shooting in darker environments.
For example, many probably buy the Olympus 25mm f/1.2 over the Leica 25mm f/1.4 precisely because they want a faster lens, however, they actually transmit the same amount of light (yet the former costs twice as much), and both are only 1/3 of a stop faster than the Panasonic 25mm f/1.7.
So people might buy it expecting to reduce their ISO from 6,400 to 3,200, only to find out it merely went from 6,400 to around 5,300.
Of course, they might offer other things that justify their price for any given customer (better build quality, bokeh, sharpness, among many other things), but spending 3 times as much in a lens for the wrong reason is something must of us would rather avoid.