I'll go the conservative route and assume final production clock at 3.4 GHz and all core turbo at 3.6, dual to few core at 3.7 and single core at 3.8.
Assuming the chip isn't too thermal or power constrained to reach turbo clocks, that's about an 8% increase in clock speed over the engineering sample. Seeing the 4790K and 6700K scores ahead of everything in the gaming aspect, it seems clocks trump cores/threads thus play the majority role. Even if the IPC to clock scaling isn't as good as Intel's, I'm pretty certain in gaming loads the Ryzen should be 1-2% ahead of the i5 6600K and probably only 5-6% behind the i7 6900K.
Since this Canard PC is supposedly a legit source, it seems it really all comes down to final production clocks at this point. Of course, I'm sure increased clocks will hamper the performance/watt a bit, pushing it (albeit slightly) in Intel's favor.