A rip from the MASTERS (I assume you mean final mix) is only sometimes a good thing, after hearing my own bands recordings before and after mastering I want a mastered version please. Mastering is an important step in the recording process, of course we master for quality ensuring there is no clipping or un-necessary compression, however some compression can be necessary to get a good result.
FLAC rips from vinyl do not come close. When a track has been mixed it is mastered for the different media that it will be delivered for. A vinyl master has a shelving filter to remove low frequencies (leaving them in will cause the needle to skip or bounce on the LP), vinyl also has a much smaller dynamic range than a CD and a high noise floor. Next the sound of vinyl is actually very tinny and lacks bass (put your ear near the needle to hear this), this is made up by boosting base frequencies either in the player (or via an LP input that some older stereo's included), so the sound has already been heavily messed with before it's even gotten to your A to D converters.