I'm no animation expert by any means, but the lines on the Mary Poppins BD are night-and-day different from the lines on the Robin Hood BD, or any of the other straight animation BD's I've seen from Disney. The "sketchy" xerox lines are still visible to me...it doesn't look like a smooth, consistently dark felt-pen line, as most Disney BD's tend to.
Again, this is the opinion of a viewer, and a film lover, not an animator...but there's a major difference between how the animation was treated here, versus other Disney BD transfers...even I can see that. In motion, it looks perfectly natural to me. And frame-stepping, it is easy to see the fluctuations in line thickness and darkness, and yes, you can see lighter underdrawings in some frames. To me, it looks beautiful. As does the live-action. This is by far the best transfer of any Disney classic to date.
Amen to this. I watched that whole sequence again and it's a stunner. I truly don't know what anyone is complaining about, but then again I'm no expert in lines or Xerox - I only know what my eyes tell me, and I can obviously reference it against the frame presented in this thread from a 35mm dye transfer print and it looks very close to that if not exactly like it.