That's sadly unlikely to happen again for the R3, as it is the same architecture as the R5. It will already profit from the prior optimizations. Maybe some gain

That's sadly unlikely to happen again for the R3, as it is the same architecture as the R5. It will already profit from the prior optimizations. Maybe some gains where hyperthreading was assumed. I checked some benchmarks more by now and it really seems like your last sentence is right: The i5 is in R5s ballpark, the R3 can't reach it.