Well, I'd say the opposite - in the real world the pre hardly matters as the days of terrible sounding pre's are pretty much gone - 95% of the time in modern mixes with heavily saturated vocals it's hard enough to hear the mic let alone the pre-amp! In high gain clean recordings, jazz or whatever, a good pre will make difference - but even then, it's too subtle for most people to notice - okay, when a/b'ing pres, there might be a bias towards the "good" pre-amp - but any modern budget pre won't prevent a hit record becoming a hit record! Mics have a much bigger influence on the sound - but then so does basic engineering techniques, the singer's mic technique - the room! If you're having to crank up the gain for ribbon or some dynamic mics - it might be worth buying a pre over another mic alternative - but you're not struggling with gain with your condenser.
Don't waste your money on pres unless you're honest enough with yourself that you just want a really nice pre - which is fine, we all like nice gear but it isn't going to transform your recordings. Poor engineering or a bad room can make a £15K vocal chain sound bad. Your gear is unlikely to be limiting the quality of your recordings early on in your "recording career". Is your recording space treated? That will have a bigger impact than a mic or a pre combined.