I'm going to make it a goal of my next mesocycle to improve my deadlift lockout. I don't have any competitions on the horizon until late winter/early spring of next year, so I think I can take my time with this.
This past weekend, I had a deadlift-only meet (that's unfortunately how they often do things here in Germany). I felt good on the day but had less-than-thrilling results, in part due to issues with my pull above the knee. Have a look at my three attempts in the attached video.
As you can see, I'm speedy(ish) off the floor, but have problems just as the bar gets past my knees. I'm thinking that I'm either locking out my legs too early, or that I've got too weak glutes. Of course, part of the problem is my leverages (long femurs, relatively short arms) and my "sumo technique" in general (still working on opening up those hips more and getting them closer to the plane of the bar). But I'd love to hear your technique/training advice as to how to improve this weakness.