Long time no post but hope everyone is having a great Holliday season thus far! I have been in the market for a new lens for my D750. I have been going back and forth from Sigma, Tamron and Nikon. Theses are some lenses I have been considering for purchase Sigma 24-35 F2 Art 35 F1.4 Art Tamron 24-70 F2.8 G 35 F1.8 15-30 F2.8 Nikon 24-120 F4 24-70 2.8 VR So let me just give a quick overview of my situation. I have currently own the nikon - 50mm 1.8G and a yongnuo 35mm F2. The yongnuo was a purchase that I made to see if I liked the 35mm focal length with the FF D750 and I actually love it and its what stays on my camera 90% of the time. However the downside of this lens is that the focus is a little loud and sometimes will focus hunt for quite a while and I will have to turn on the camera and off to fix it. This is a huge problem for me as it makes me miss my shots or make people have to wait for a while until I can resolve the problem, plus it is a bit soft but hey for under $100 its really not bad. One of my concerns with the third party lenses is from all the research I have seen and read watched it seems to me like Sigma and tamron both need to be fine tuned for focus issues and need to be calibrated straight out of the box. Now this may not be difficult to for some but from the videos I watched its not something that I really want to do when buying a lens and quite frankly I don't seem to understand how to or what to do to calibrate them with those docks that both Sigma and tamron sell. The other things is resale value and future proof with those said brands. I have tried to narrow down what it is that I really want out of this next lens purchase and I think I would like to have some wide angel and a bit of telephoto thus thinking about the 24-70 VR. I also consider the 24-120 F4 for focal length. My kids play sports and I know this is not your typical sports lens, in day light and snaps it should be ok. I do like to take pictures in low light and this is where the VR would hopefully compensate for the slower glass but for $1000 more I can get a used 24-70 VR.... that is faster and I am sure produces much better images. Well I am planning a trip to disneyland very soon and as much as I would be cool with taking the yongnuo 35 F2 and nikon 55 f1.8 what I don't want is to be in that situation of swiping out lenses because the yongnuo is having focus issues. At a place like disneyland you just don't have the time to be messing around when taking family photos. However the 24-70VR is big and heavy and is it a lens to walk around with all day in the park? Would the 24-120 be better? When going on rides there is no way I will leave me camera gear off to the side and will bring it on board with me and so little worried that having a big lens may make things difficult but ,..... At the end of the day because all these lenses are pricy I want to make sure I get the best lens first I have considered the non VR version of the nikon 24-70 but I kind of feel since this is not an upgrade and rather a new purchase I would be better off with the newer VR version ( i also love to shoot low light and natural lighting) any words of wisdom and advise would really help me out here folks. Thanks in advance.