TimeScapes, YUV422p10 4K version.
A friend of mine bought the cineform version(4096x2304 with lossless audio) for 299USD, and shared the source to me. So I've got a source as good as the master tape.
The source is claimed to be encoded in RGB36, but the decoder only returns YUV422p8(4096x2304 in Luma, and 2048x2304 in Chroma)
So I did not use the usual YUV420 format since that will reduce the Chroma resolution into half. Keeping the YUV422 format and using 10bit of encoding precision should maximize the quality maintained.
major encoding parameters: ref=5 / deblock=1:-1:-1 / me=umh / subme=10 / fade_compensate=0.00 / psy_rd=0.90:0.10 / me_range=32 / fast_pskip=0 / chroma_qp_offset=-3 / fgo=0 / bframes=8 / b_adapt=2 / weightb=1 / weightp=2 / keyint=480 / keyint_min=1 / mbtree=1 / crf=18.0000 / qcomp=0.70 / aq=3:1.00 / aq2=0 / aq3=0