Sony's players have good quality, but I can't say they are at the top of my list for picture quality. They used to make some of the best interlaced players, but progressive doesn't seem to be their forte.
I've owned 3 Panasonics so far (including my 1st gen A300U) and I was quite pleased with all of them as well. They all held up well and had great picture quality, which is why I'd recommend the S97. In the Secrets of Home Theater Progressive tests, the S97 scored a 91, which is not setting the standard, but is very good.
With the Denons, the least expensive ones are marginal, but the mid to upper level ones are excellent in terms of picture quality, most scoring well in the Secrets tests also. It may be a small detail, but most of the Denons (all the ones I've owned) have nearly no visible layer change.