My results with Acros support John's findings. I give the sharpness edge to TMX as well as an advantage in grain structure--TMX has better defined and sharper grain structure. With that said, however, I do find Acros' tonality very appealing. Acros definitely has an advantage in highlight separation; midrange separation is very close, but I'd give a very slight nod to TMX. But the most appealing characterist of Acros is its reciprocity characteristics. I shoot a lot of long exposures, mostly night scenes in NYC, and I find that not having to adjust for time and contrast is a great benefit.(posted 8168 days ago)Ryuji, I was a dedicated user of HP5+, but I've since switched to Delta 400 (new). And it's not because of sharpness or grain. HP5+ has at least as fine grain and resolves as fine detail. And TMY beats all the 400 speed films in those respects. HOWEVER, Delta 400 has tonal characteristics that lend a 3-dimensional look to images I've never seen with another film. I don't really know how to quantify it, but it is simply beautiful film. Is it worth 50% more than the others? To me it is. I bulkload 35mm which somewhat mitigates the cost.