It's either the PDF itself, or you're not at exactly 100% zoom.
Please send your feedback to:Unfortunately every pdf I tried has the problem. It also does not seem to be related with zoom levels. Interestingly the problem does not occur if a pdf is opened in safari.
Had this problem too. Just installed DP5 and the PDFs don't look blurry anymore. I compared to safari just to make sure, and preview.app looks the same.
yes, it's fixed now