Can't edit my post #79 above (some mod please delete it), so here's the updated list... yowzer.
system: i7-3770, 16gb ram, win8pro-x64
test method: flac.exe -8 input.flac -o output.flac
flac 1.3.0 binaries: http://www.hydrogenaudio.org/forums/index.php?showtopic=101082
________________________________________________________________________________
input: bytes file MD5 fb2k verification MD5
flac 1.2.1, 3h22m, 44.1kHz/16bit/2ch 1,708,858,410 1092139DA14A43C016F614A1A070598C FC2B730F57920D49D4E41604FE14A623
________________________________________________________________________________
results: time ratio bytes file MD5 fb2k verification MD5 flac.exe MD5
1.3.0-case-x32 2:47 0.998 1,705,099,033 9BE9ABC5283909DC0F08A822F0B8FF46 FC2B730F57920D49D4E41604FE14A623 4ADD826644D303B57D220F866C67292B
1.3.0-case-x32-fb2k 2:47 0.998 1,705,099,033 9BE9ABC5283909DC0F08A822F0B8FF46 FC2B730F57920D49D4E41604FE14A623 4ADD826644D303B57D220F866C67292B
1.3.0-flacfrontend21-x32 2:49 0.998 1,705,099,033 9BE9ABC5283909DC0F08A822F0B8FF46 FC2B730F57920D49D4E41604FE14A623 8C4AE54CE1B243904CEAB30575534FB3
1.3.0-flac-git-3194829-x32 1:57 0.988 1,705,098,763 49D7D89FAD8335F339915F7FED0C1265 FC2B730F57920D49D4E41604FE14A623 3B67802CC3D2BD4572B9466763BF2E21
1.3.0-flac-git-3194829-x64 1:53 0.988 1,705,098,763 49D7D89FAD8335F339915F7FED0C1265 FC2B730F57920D49D4E41604FE14A623 27924BE6762C8CEC06CE811DF0513ECA
1.3.0-john33-x32 2:52 0.998 1,705,099,033 9BE9ABC5283909DC0F08A822F0B8FF46 FC2B730F57920D49D4E41604FE14A623 C31C314E8C1E8DC62EE0CDBE048C6112
1.3.0-john33-x64 2:38 0.998 1,705,098,763 49D7D89FAD8335F339915F7FED0C1265 FC2B730F57920D49D4E41604FE14A623 29546F37C3EB364155FADD43EC570DED
1.3.0-lamedude-sse1-x32 2:53 0.998 1,705,099,033 9BE9ABC5283909DC0F08A822F0B8FF46 FC2B730F57920D49D4E41604FE14A623 F08E20ADF2042919CA3BF8305E36CFF6
1.3.0-lamedude-sse2-x32 2:47 0.998 1,705,099,033 9BE9ABC5283909DC0F08A822F0B8FF46 FC2B730F57920D49D4E41604FE14A623 6C52EEA53F27CFEC697632194AA4D5D5
1.3.0-lamedude-x64 2:58 0.998 1,705,098,763 49D7D89FAD8335F339915F7FED0C1265 FC2B730F57920D49D4E41604FE14A623 174360529CEBF9371B41019D46F1FDC4
1.3.0-lrn-mingw32-x32 3:18 0.998 1,705,098,763 9BE9ABC5283909DC0F08A822F0B8FF46 FC2B730F57920D49D4E41604FE14A623 E87DC0158474E662637886797F36C0DA
1.3.0-lrn-mingw32-o2-x32 2:52 0.998 1,705,098,763 9BE9ABC5283909DC0F08A822F0B8FF46 FC2B730F57920D49D4E41604FE14A623 E0D5DAE8EF9BA49D0822901FE5D114A6
1.3.0-lrn-mingw32-o2-core2-x32 2:45 0.998 1,705,099,033 9BE9ABC5283909DC0F08A822F0B8FF46 FC2B730F57920D49D4E41604FE14A623 4D650372DBDB65DCC76E34DBAA42FB8F
1.3.0-wcd-x32 4:00 0.998 1,705,099,033 9BE9ABC5283909DC0F08A822F0B8FF46 FC2B730F57920D49D4E41604FE14A623 E5639F8BABD64836B85B4DB119279A7B
1.2.1-official-x32 3:12 0.998 1,705,099,033 2BA84F8B1B5514BE4BED536F341875C7 FC2B730F57920D49D4E41604FE14A623 16344C45643E41544A5C1C926A109C9F
1.2.1b-official-x32 3:15 0.998 1,705,099,033 2BA84F8B1B5514BE4BED536F341875C7 FC2B730F57920D49D4E41604FE14A623 B8396749F374C9F48CBE3B16C5333D49