The price difference in the online-shop you mention is ridiculous, indeed... Have you checked elsewhere ?
Roger, what is "tonality" ??
Dear George,
Good question. It's a lot easier to recognize than to describe. Allied terms are 'glow', 'richness' and even just 'look'. 'Sparkle' is related but has been quantified by both Zeiss and Ilford as very high MTFs at relatively low frequences.
Basically, it's what's left when you take away all the easily measured criteria such as grain, speed and sharpness, and concentrate on the way the film records tones, dark, medium and light. That's as printed, if course, and paper makes a difference.
We're all familiar with 'muddy-looking' pics, and with 'soot and whitewash' contrast. These are perhaps the extremes of tonality. Good tonality is somewhere between these. When we compare two prints, it's normally easy to say which has the tonality we prefer, but explaining why is another matter.
I wish I could be more specific, but it's a slippery concept. I hope this helps a little.
Cheers,
R.