Sorry to say, no eink reader handles PDFs very well ...
PDF is not an ebook format and it was actually designed to show documents on their real size. For these and other reasons, using a slow eink refresh screen may not be the best for PDFs files or documents. Also, moving back and forth inside the actual PDF (like chapters) can be difficult.
I used to have a Kindle DXG but sold it and bought an iPad (it was an iPad 2, i use a mini now) I am not able to read outside anymore, lost that ability, but it handles PDFs extremely well; I use GoodReader.
So ... if you really want to give it a try, check Kindle DXG. Sony ereaders are known for their PDF capabilities but they have smaller screens.