I've just had some old transparencies printed up by Peak Imaging in the UK. A few 35mm slides I had printed up to 18x12". I wasn't expecting much, the largest I've ever had 35mm enlarged to was about 10x8", but my word, they look great! I have some provia, some velvia and some K25, usually taken with either Olympus, Nikon or Tamron lenses, on a tripod, mirror locked up etc. Grain hardly visible, really sharp and lovely colours. It's forced me to re-evaluate my opinion on the quality of 35mm. There is an amazing amount of detail in there. Mind you, the prints from my 6x7 slides from my RB67 are...well you can guess!