I thought it was worth it.
The major benefits of the Sophias are that they cost less, and are easier to drive with excellent but less expensive amplification. They sound truly fabulous with gear such as the Naim Nait 5, or the Music Reference RM10 which are not the best matches with WP7s. The Sophias can sound even better with mega expensive stuff, but I think that the superiority of the WP7s is better revealed in that context.
The benefits of the WP7s that have the most meaning to me are that they are more dynamically nuanced, and can be set up with more precision. They have less residual noise, play louder, deeper and higher. They are clearer through the midrange, have a more precise soundstage, and have more palpable imaging. Whether these have any meaning to you is completely a matter of personal taste.
The Sophias are incredible speakers, the WP7s are more so, the MAXX2s more than that, and the Alexandrias more than that. I don't think you can go wrong in any case. Listen and decide what's best for you.