I'd go for the f1,4, based on using both the 1,2 and it. The f1,4 is slightly less costly, too 🙂 A good all-round lens.
I have bought a couple of lenses from Gokevincameras, and both were more than I was willing to pay as listed. But I found Kevin reasonable about discounting when asked; hence, the reason I did buy from him eventually. I have no problem at all with Kevin as a businessman, yet there are asking prices he sets to which I would give a pass; but doesn't that have more to do with being an informed buyer than a strike against a seller? I don't hold it against a seller who is trying to maximize his profit on an item. Whether or not I choose to buy, that's where I can put the blame. As with any major consumer item purchase, it is wise to keep oneself reasonably informed about the market before purchasing.