My first thought on seeing this post was that the Dimension was a dinky little van but Mr Google tells me it's based on the Seville - Ducato type vans, so you are going to be downsizing.
Many people on here have downsized and I would be surprised if you get anything but positive comments, especially seeing as it's a California forum and only enthusiasts are likely to subscribe.
The California is a very well designed small van and despite it's size feels airy and has comfortable seats and beds. It is a mile eater and can cover large distances without discomfort.
However, if you like to have a partitioned of loo and shower facilities then obviously it does not provide this. It depends on your priorities. I think you want one!
Anyway, do you really want to drive a toilet around Europe? Or an iconic VW Campervan
PS: If some of the posts on here are correct regarding residuals it looks like you could get your Cali now, have your holiday and get most of your money back afterwards if you decide you've made a mistake.