New Sigma 150-600

Looks like Tamron gets some competition,

Sigma to announce new 150-600mm f/5-6.3 DG OS HSM and 18-300mm f/3.5-6.3 DC MACRO OS HSM lenses | Photo Rumors

Yeah, there's another thread about it here somewhere. Looks like it's a cut above, but the question, as always, is it worth the extra coin? I'm waiting to see the images from it.