ApostleP does several videos talking about a variety of knife-related topics, though a lot of his recent videos have been reviews and impressions. He also runs a sharpening service, so you see a lot of variety and some good videos on sharpening from him as well. He's on a bit of a break right now for a vacation I think though, so we might not see many videos from him right now.
Another good one along similar lines is SolosKnifeReviews. He works modifying knives and sharpening, so you get to see a lot of one-of-a-kind pieces very frequently on his channel, along with commentary on why some knives are good and others aren't, going beyond just reviews.