It's prime time of year for the best and worst of the week, with pre-Tokyo motor show reveals titllating us with previews and the weird and wonderful mix that Tokyo brings. It's been busy enough for there to be a pretty eclectic selection this week, mind.

As usual, here are the five best things I've seen this week, along with one groan-inducing thing.

The best things I've seen all week 

Toyota GR HV concept

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As if the week hadn’t been full enough, Toyota comes along with one of the most exciting-looking concepts of recent years. But the same could be said about the SFR and FT-1, and only the FT-1 is even remotely near production today. 

Still, titillation is better than nothing, and the GR HV looks eerily like a modern-day 222D. Put. It. Into. Production. Now.

Polestar's first car

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Styling is a matter of taste, but the styling of Volvo’s Concept Coupé of the 2013 Frankfurt motor show transcends opinion; it’s now fact that it’s a stunning concept. 

The good news is that it looks likely to be put into production, following Polestar’s jigsaw puzzle-like preview campaign on Instagram. Extra marks to Polestar for making us work for a convincing preview, rather than just putting a murky picture of a headlight bulb under a 'coming soon' caption. And it looks largely unchanged from the concept. Be still, my beating heart.

Harman Kardon sound system in Kia Optima Sportswagon PHEV

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Seen, heard, whatever - the Kia Optima Sportswagon PHEV is a pretty refined car at the worst of times; the perfect foundation for audio enjoyment. 

But the Harman Kardon sound system - which comes as standard on the PHEV - transformed my favourite songs into utter perfection. I’m no connoisseur, but the depth, clarity and power of that system left me speechless. I extended a shorter evening jaunt in the Optima to a full three-hour road trip upon this discovery.