Yes. Single threaded performance is very favorable in games of today. More than 4 core and 8 threads won't do much for you in most games today as most developers don't parallelize the code that well to take advantage of more cores. It's a lot of work for the developer and most have strict deadlines they have to meet so there just isn't time to optimize the game to run on many cores nor does it make much sense to do the extra work because how many people have more than 8 threads these days? Not too many. In fact I'd say the 8 threaded or higher cpu's are a minority especially on the Intel side. Maybe not on the AMD side though because the FX 8320e is rather cheap. But where those higher end broadwell-e chips shine is the cache which can be very beneficial in some games. As you can see the Core i7 5775c Broadwell cpu beats the higher clocked 6700K in a few games due to its 128MB of L4 cache. This is unrelated to the broadwell-e though.
So clock speed isn't the whole story but still on the whole the Core i7 6700K is the best out there for high performance gaming right now.