The trouble starts when everyone is able to view their pix at 100%, which is like printing a pix 1m wide. So, you start to see all the flaws in the picture. When you view or print at realistic size, you cannot see those noise, CA or other minute flaws.
When you compare among those multi-coated ones, hardly any difference. Color cast? Well, it is only when you need such color accuracy that it makes a difference. If not, under normal circumstances, you can hardly see it at all.
We all know that those Hoya HMCs are hard to clean. But then, how often do you need to clean them?