I've said all along that you probably aren't going to want a Batis 135mm. At every FL the Batis is going to be 1 or 2/3 stop slower than the typical fast prime (25mm f/2 vs 1.4, 85mm f/1.8 vs 1.4). That's just evidence-of-precedents reality and it seems some just aren't paying attention to that. If you want fast primes it's going to come from Sony, period, unless Sigma starts directly addressing the e-mount market.
This is exactly why I've wanted a Batis 35mm 1.8 or 2 and did not want a Batis 135mm.
That said, I'll withhold judgment on a Batis 135mm till we start seeing some images. The Loxia 85 seemed like a loser lens to me until I saw it's IQ excellence. A Batis 135mm f/2.8 could still be amazing if it's super sharp with the right kind of OOF rendering.