After 2 years and 50,000 km Í am on my 5th set of Pirelli Diablo Rosso now. I stuck with the DR3, but I will now try the DR4.
1. Set: complete change at 13,300
2. Set: complete change at 22,500
3. Set: complete change at 33,300
4. Set: rear 39,700, front 40,700
5. Set: rear 46,400, front 48,500
Apparently, due to several racetrack and road trainings I changed my riding style a bit or the time
I agree with Stonewolf that somehow the Pirellis still look OK one day and after a weekend with 500 km suddenly the cords begin to show.
I am quite sure that even if the Pirelli is not the best choice that tyre still has way more potential than me. Not having had any issues yet, I probably will stick with it. If that is called risk averse, I'm OK with that
BTW other fellows recommended the Bridgestone Battlax.
Surprisingly, I was also advised to look for Mitas tyres (I think it's a Czech subsidiary of Continental) which are said to be high quality for low price.