couple of approaches we can try are
– we should know our Style/pattern of Photography. For this just go and check your last 200 pics, you ll start realizing that your strength lies one particular style. Wide, portrait, Landscape, animal, natural .. etc.
– Sites where we can get reviews are
– One of my fav site to make my decision final
Go to left ADVANCED SEARCH, and select your model + lens – see the result before buying it.