So, three months ago I dropped my Nikon 24-120 f4 lens!! I was devastated as this along with my 70-200mm are my go to lenses for most of my work.
I took it to a local repairer and they wrote it off so maybe it's a good time to look at alternatives, having an f2.8 lens would offer me more choices in low-light, portraiture and product photography, so that's what I did, I looked at all the f2.8 lenses on the market to see what was the best available.
I first looked at the latest Nikon 24-70mm f2.8 - That unfortunately was well out of my price point so I looked at the two leading alternative lenses from Tamron and Sigma.
After reading so many reviews that I was going crazy, I decided to purchase the Tamron SP 24-70mm F/2.8 Di VC USD G2 why? well the first point was price, I love my Nikon gear but the prices are just pushing people away and the gains are not worth the added expense. Yes, the Nikon lens is faster in low-light and maybe a tad sharper at the edges but seriously, none of my clients would never know the difference.
What I like about the Tamron is that it feels solid, the focus ring is smooth, the images look great and sharp and the bokeh is fantastic, it feels stylish and is well balanced in the hand after a days shooting!
What I dislike about the Tamron though is the auto-focus speed in low-light even at f2.8 it does struggle at times where there's low contrast, but hey, thats the compromise and if it's the only thing I can complain about then it must be a good lens for the work I do.
So, if you are like me and don't want to spend a small fortune on new gear (sorry Nikon), then the Tamron offers the perfect alternative. Do some research from other users and you will find the same response, but you can always hire the lens and try it out... you won't want to give it back though!