Just comparing the new Wordpress version of this theme, I notice that the Wordpress version looks much better in a number of ways all related to margins. The logo, menu, post images are all moved more to the left. This isn't a browser issue because I see the changes reflected in the promo images you've used for each template.
These small differences make a big difference visually - I presume this was a conscious decision on the part of your designers - do you plan to update the joomla template to include the improved CSS? Alternatively could you share the updates?
Many thanks