Zoom is not practical, because it resets to no zoom when you turn the page. And it's no way to read, constantly panning the page.
Of course you can always use reflow. Sometimes it works really well, sometimes it messes up the formatting of the page. It depends on the pdf.
Pdf is not a good format for any ebook reader. Some handle them better than others, and you can certainly benefit from a bigger screen if you absolutely need to read A4 pdfs in their original size. If you are going to make your own ebooks, there are other formats which work much better for ebook reading, like epub.
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