Amazon Prime Video currently holds the streaming rights for VTV in most regions. The platform offers a version with a high bitrate. If you have a 4K TV with upscaling capability (like Sony’s X-Reality Pro or LG’s α9 Processor), the quality comes remarkably close to a native 4K image.
If you are looking for that specific "4K feel," your best bet is to use a high-quality 1080p source and let your 4K TV's built-in do the work. It usually produces a much cleaner result than a compressed "4K" file from a random website.