I've ran Yokohama before albeit some time ago and from memory they were good but as you point out soft.
I've had the Yokohama V105's on from new, so whilst my experience with other tyres is limited, I'd say they are very good - At around £80 a corner, it's not a bad shout price wise, either. (And Jap tyres for Jap car, which is most important
They've been on for 14000 Miles now, and the back tyres are virtually still new, with about 5mm on the front:- Turn in response is excellent; Even when I've cocked up a corner entry, with a dab of front brakes they whave brought me round very quickly:- I've never had any squeals etc. whilst cornering, so even when it's gone a bit wrong they still have a fair amount left in them. Wet perfomance on the V105 gets knocked back a little by some newer tyres in the more recent tests, I've never had an issue with them in the wet, even when doing 115 (That's all the 1.4's got
) on the Autobahn. They've proven sturdy, too, as a with a fairly harsh kerbing (wince) they just bounced off, when I was fully expecting them to go pop
One downside to the tyre, as with most summer tyres:- It is completely and utterly incapable on even the lightest of mud / wet grass - If you go to any winter rally stages, and park in a wet grass car park, take a friend to push you out - Speaking from experience!
Further to that, I wouldn't mind them being a little quieter at speed, though I don't have much of a frame of reference on this given the first sentence, though I imagine most would like their tyres to be quieter - It's just the roads here, In the Netherlands / Germany, I could only hear the engine
I think anything much stickier and you will start seeing rapidly deteriorating tyre life, though if price is no object, you could just constantly lob Michelin PS3s at it