There's always been a feeling that the tweeter used in the 30 and 40 is superior to that of the SLH5 - nothing confirmed - just a feeling kicking around the net for a few years now.
It would be great if you could feed back your impressions of the 40.2s. I've never heard a pair (only SLH5s sadly) but the 40s have long been regarded as amongst the big hitters of the audio world.
At least going back around 20 years ever since an iconic review by Robert E Greene.