I am also looking at upgrading but can't afford a dslr with the zoom lense I want. I have a 765C olympus and love it but would like to upgrade for more optical zoom and image stablization. Unfortunately I haven't seen one with much better quality than I have on my 3 year old camera.
Quality is probably a constant but capability has grown. The best of breed 12x superzooms (Steve's list)will take will take photos that are simply outside the range of what the Olympus can do. That's what 12x zoom, ISO 400-800, and optical image sabilization accomplish and in the case of my Z612, minimal PP. Within the capabilities of the Olympus on might be hard pressed to see a difference.
Nice picture by the way. Do you have the original EXIF data?