For what it's worth, I personally think svt-av1 also produces a worse looking picture than aomenc. I'm not personally convinced that AV1 is at fault, just that the x265 encoder is much more mature than svt-av1, aomenc, and rav1e. I haven't tried a high quality film source yet, mostly just SD animated things, where svt-av1 usually loses to aomenc in what I'm looking for (best quality picture per bitrate), but svtav1 tends to win out in encode speed.
If you haven't tried it out yet, I would suggest trying av1an (an encoding framework) with aom and at least comparing a few samples with what you get out of ffmpeg and svt-av1. Av1an can do chunked encoding, which helps speed by running multiple encoders in parallel. I don't think that aspect helps much with svt-av1, but it does seem to help with aomenc.
I wrote a bit about it here (https://lemmy.ml/post/2843230), though I didn't include any film grain settings in that post.
I'd be happy enough with a Smart Fortwo style vehicle. I'd be more than happy with good public transportation and non-car dominated urban planning. I'd be over the moon for high speed rail lines covering the country.