Aaron – The big problem with blogging is that there is an echo effect to it, and bloggers end up chasing the same keywords that other bloggers are targeting, and many of these have limited commercial viability.
Instead of comparing your blog to other blogs, you can step outside of that echo chamber by comparing your site to commercially oriented sites in your field. Blogs have significant authority and Google’s algorithms tend to prefer to rank informational pages to commercial sites, so you should be able to outrank commercial sites for some of their most important keywords. Link.