Except if any of your pages are cached between eyeball and your server and so your server logs don't capture everything that is going on. You can get fancy with web server logs, but depending on what you're trying to understand it may not be the data you need.
<source: did fancy things with logs over the last 25 years, including running multiple tools on the same site in parallel to do comparisons (Analog, AWStats Urchin, GA, Omniture, homegrown, etc...)>