Since with blender test we know that the MT mean IPC is the same as broadwell-E there are 2 possibilities:
1) AMD SMT it's better than INTEL's. So in ST Zen will be slightly inferior.
2) AMD SMT it's worse than INTEL's. So in ST Zen will be slightly better.
This in blender.
Pick your choice...
But please note that, at least in blender, it can't be both SMT and ST IPC worse than INTEL's...
Anyway Zen was an early ES, with 2 memory channels, vs 4, and probabily with the RAM at low clock, so final product can be better (at least in clock frequencies)...
1) AMD SMT it's better than INTEL's. So in ST Zen will be slightly inferior.
2) AMD SMT it's worse than INTEL's. So in ST Zen will be slightly better.
This in blender.
Pick your choice...
But please note that, at least in blender, it can't be both SMT and ST IPC worse than INTEL's...
Anyway Zen was an early ES, with 2 memory channels, vs 4, and probabily with the RAM at low clock, so final product can be better (at least in clock frequencies)...