Kinda my thinking. If it’s taken 5 years to save for, you must be on a very tight budget.. is it worth it? You seem to be a hobbyist only, so is spending a grand on a lens going to improve your photography to any massive degree? I know what it’s like, trust me, but sometimes you gotta just realise that chucking money at a hobby doesn’t mean you are going to improve much or gain much from it. There are much cheaper alternatives from sigma and tamron. Maybe consider one of those.
True story.. About 2009/10. like you I wanted the best. I saved up for ages and finally bought the Nikon 70-200 f/2.8 VR. I thought I was the dogs danglies, I had the one of best cameras you could buy and the best lens. Did it make me any better.. hell no. I was massively disappointed with it. Sure it was sharp and the images looked nice, but it just didn’t gel with me. I sold it after a few weeks Thankfully I didnt loose much money on it.
Something then came up that I needed a longer lens for. I couldn’t justify the Nikon again, so I bought a sigma 70-200 f/2.8 dg apo macro. I paid about £300 for it. It has no optical stabilisation and doesn’t look particulary premium, but by god.. Something just clicked. The images looked fantastic.. Sharp, clear and the colour rendition was amazing. The complete opposite experience I got from the triple the price Nikon.
The lens was so good, I still have it to this day.
So I guess the moral is, just because something has a huge price tag, doesn’t always mean it’s going to change your life. Or something like that.