The DVCPRO50 recordings look fine except for lots of alias on clothing, bricks, diagonal lines, etc. Lowering detail to -5 helps. But of course you begin to loose sharpness.
Others have suggested that I do not have the proper hardware to downconvert the DVCPROHD recordings. Yhey are noisy, soft and loaded with alias artifacts. BTW, I get the same result with DVCPROHD recordings from the Varicam. As I said the DVCPROHD recordings look great on the FCP Cinema screen so I know the camers makes a great picture.
Thank you for your response. I will continue to research my hardware needs.