Absolutely. The obsession with 4K often misses the point of catalog films. The Core was finished on a digital intermediate that is native to 1080p at best. Upscaling a high-bitrate 720p x264 file to 4K on a modern TV actually looks better than a poorly compressed 1080p file.
The Core (2003) Format: 720p BluRay Video Codec: x264 Audio: Dual Audio (English + Secondary Language Track)