If you have a lens spanner ($20ish dollars) the 1.5 is super easy to open up to clean the haze out. You can find videos on youtube to show how. Basically take the ring out of the back of the lens and it open into two parts. Unscrew the rear element to get to the glass closest to the aperture and then clean that. First time might take 15 minutes. The 1.2 is the same way.Mine came with the 1.5, but it was all hazed up, so Im sticking with the 1.8 or 1.9 I have.
The haze on mine ended up being etched to the glass.If you have a lens spanner ($20ish dollars) the 1.5 is super easy to open up to clean the haze out. You can find videos on youtube to show how. Basically take the ring out of the back of the lens and it open into two parts. Unscrew the rear element to get to the glass closest to the aperture and then clean that. First time might take 15 minutes. The 1.2 is the same way.
Curiously, I haven’t had to do this on the 1.4 or dream lens. Have not owned the 1.8 long enough to see if it does this.