So, I recently picked up a Pixel 5a on sale and gave the Motion Cam app a go on it. I've been having some fun and finding some fairly consistent results with the full sensor (4032X3024) @ 12FPS. I think the sensor size comes close to super 8mm sizing and the results definitely have an 8mm vibe.
The screen grab below is from a cinemaDNG sequence dropped into Resolve on a 1080p/ rec709/ linear timeline -> color space transform (which I didn't even know you could use in the free version) ARRI LogC output gamma -> ARRI Alexa LogC to rec709 LUT -> bumped up the saturation a bit and brought the shadows down with the log wheels
Be gentle; what I know of a RAW workflow has been learned in about 2 hours this week.
There's no noise reduction applied, but it seems like the downscale helped clean things up and give a more film like quality.
The app is a bit clunky, but is obviously in beta and can't be fully criticized yet. Manual focus would be amazing and there were some exposure shifts that may or may not have been my fault. If someone sold this technology with a MFT lens mount on it as a modern 8mm camera I would for sure buy one. It's been fun and I'm enjoying learning about RAW correction/ grading.
There seems to be a few people catching on to the app on YouTube. People with more powerful phones seem to be having better luck with things. Hopefully development continues with success and RED doesn't interfere!