I had the 35mm f/1.4 for years, loved it. Bought a 33mm f/1.4 ($705 open box), took a bunch of photos alternating between the two on my X-T3.
At f/1.4, the 33mm is on a totally different level, it’s hugely sharper. The 35mm is a hazy soft thing with lots of CA compared to the 33mm wide open at f/1.4. If you stop the 35mm down to f/2.8, it’s roughly as sharp as the 33mm is at f/1.4. This is why the 33mm is twice as big.
If you often want to shoot at f/1.4, the 33mm absolutely crushes the 35mm. Stop down to f/4+ and the difference is minor.
Focus on the 35mm is noisy and not super fast. It’s great for single focus, less great for continuous focus. The 33mm is insanely fast and silent, it’s on a totally different level at continuous focus.
Character wise, I find the 33mm to have really nice bokeh and color. Similar vibe to the 35mm, just way sharper wide open.
I sold the 35mm. Wonderful little lens, many good memories, but I often shoot at f/1.4 so it was a very easy choice to go with the 33mm.