While x265 is the present, the future is x266 (Versatile Video Codec) or AV1. These codecs promise another 50% reduction in file size. However, hardware support is currently zero. x265 will likely remain the standard for "rips" for the next 5 to 7 years until the next generation of silicon catches up.
A professional-grade technical paper or guide on x265 should include: Compression Efficiency x265rips
If someone uses --lossless or crf 0 (rare), size can be huge. Or they encoded from a remux without compression. While x265 is the present, the future is
This is the gold standard for archivists. Despite the name, 10-bit encoding is not just about color depth (it does allow for 1.07 billion colors vs. 16 million). The real benefit is mathematical precision . A 10-bit encode suffers from far less "color banding" and compression noise. Most high-quality release groups will only release x265rips in 10-bit, as it yields smaller file sizes with higher fidelity. Note: 10-bit requires modern hardware. x265 will likely remain the standard for "rips"