The MYR-Groestl network hashrate hovers around 3-7 Gh/s on CPU/GPU mining (compare UTC 5-8 Mh/s lately) - so UTC is only 1/1000th approx of the MYR Groestl CPU/GPU mining power (but we need to appreciate that it takes more grunt to get a Mh/s on Scrypt Jane than MYR-Groestl).
No. It looks like UTC relative hashing power is well over MYR-Groestl.
With Myriad-Groestl just one 750Ti may give over 11Mhash/s and one R9 280x something perhaps between >10 - <20Mhash/s
(ref:
http://myriad.theblockexplorer.com/help.php )
My just one tiny 4x R9 280x rig give around 17kHash/s(gross) with UTC and 4x750Ti rigs some amount less.
And more "fun". Quite soon (2015-01-22) UTC N factor rise from 14 to 15.
But yes, if someone have. say example well over 1200 x R9 280x farm he can try but still not at all easy.
Of course it is possible that some develop lab test with MYR they FPGA-ASIC hybrid machines what they try develop for many algoritms and for higher N factors.