I have the Galaxy S leather case and be warned the epic fits very snuggly in it. Heck that link in the post above mine, I typed in epic 4g to test compatibility with the case and they say the epic is not compatible with that case (even though sprint is pushing it). It is to the point where I am thinking about trying the seidio leather case to see if it fits better. I am kinda worried because the seidio case seems like it might be a generic case not specifically cut for our phone.
So yea, I have the leather galaxy s case and I am still looking for a better leather hip holster solution.