There's nothing fundamental stopping semiconductor technology to reach those feature sizes and a fair comparison is between technologies at the same development stage. If you use the proxy of what is commercially available today CMOS sensors beat film. There are still reasons to use very large film, mostly because no one develops large enough sensors (and even if they existed cost would be very high), but the advantages are being overstated.
"There's nothing fundamental stopping semiconductor technology to reach those feature sizes"
The laws of physics most certainly are THE fundamental thing in the way. Electron leakage, current ripples at nanoscale, capacitive interference. There's a lot more involved when it comes to semiconductor technology.
