I traded in my 35mm 1.4 because it started acting funny. It would suddenly shut down and freeze, and an error message would pop up telling me to turn the camera off and back on. Half a dozen times of this happening and I decided to turn it in and get the 23mm 1.4 instead. Which I love.
I have the 16mm and it's pretty much my favourite lens. No distortion and has great close focus. When I want wider I have the 12mm Rokinon. I find there are times, however that I want something between the 23mm and the 56mm. I find myself missing the FoV of that 35mm. I keep debating whether to get the f2 or to get another f1.4. I'm leaning toward picking up a used f1.4, convinced the copy I had was just a bad apple. I just think the older 1.4 is a bit higher quality, and I don't mind the size and weight compared to the f2.
I'm going to wait until my X-T2 arrives however so I can try them both on the new camera. I want to see how the older 1.4 35mm performs on the new body. Then I'll decide. But I don't really need the 35mm. It's just GAS.
First world problems...