Since nobody volunteered listening to both, I have a home dem (slightly embarrassing given my drawing the line thread). So far I would say the leap in quality is commensurate with the leap in price (and I've only flicked a dip-switch or two, no GLM, yet). The scale, clarity, speed, imaging, surprising bass (well controlled), all there. Bigger sweet spot, good for family films. I had a go with the baby Tannoys and always knew that a mid-field coaxial might be the thing for me.
I would agree with some reviews that there's a slight dip in the lower mid-range. they measure pretty flat, obviously, and apparently the brain compensates for this dip naturally, so who knows. The source seems to matter! - The Audial S4 is a lovely partner, as is a Technics with a DV xx2, my Toppings and Eversolo a bit in yer face. I’m not really blaming the Toppings, these are just ruthless monitors.
The question for me is twofold: They are a lot of money and the 8030s are very good; how much do you wish to know how drunk the bass player or the third violinist are? The second question I can answer by moving to my valve based system, the first is likely to cost me that lot of money. It's no justification but the baby Tannoys, a couple of subs (definitely needed), and the amps to drive them, would cost a lot more than these Genelecs.