The first picture is of the Roadsmart 2's I had before I tried Michelins but the odd thing is,the front was also shot on the Dunlops. I've never worn a pair of tyres out together and wouldn't use Dunlops again. I seem to think I got around 2500+ miles from the Roadsmarts.
I've got PR 4's on my R1200R that I keep in Spain for me and the Mrs to use and they've not lasted too well. The edges have gone but the centre is OK!?!
Although the Michelin rear has gone on the sides,grip was good but it now moves around a little on full lean. The front is OK and will probably outlast another rear. The PR4's have covered less than 2000 miles.
If the PR4's last better than PR3's,I'm glad I didn't try the 3's
I'm OK with this rate of tyre wear while they grip well and keep me upright and if I want to use tyres that last 1000's of miles,I'll take the car.