I agree with the comments above about it being very system dependent, but perhaps to explain a bit more......
I think the reason why Lampi is so popular is that it provides great tonality and flesh to digital sound, in an environment where many high end DACs focus on resolution which can sound thin and reedy. The Golden Gate 2 is the pinnacle of the Lampi hierarchy in this sense.
The Pacific was aimed at taking on the DAC manufacturers that focused on detail and resolution, while still maintaining the house Lampi sound.
If your system excluding the DAC is fully-fleshed tonally, then the Pacific will be a step up, as you get greater detail and nuance to the music with little give-up in tonality and timbre. If your system is on the lean side, however, you will likely prefer the GG2 as the drop in musicality will be noticeable.
When I was running Berning Quadrature Z's as power amps, I preferred the GG2 by some margin. With the Audionet Heisnebergs I prefer the Pacific by a similar margin, enough to justify the cost upgrade.
I think Ked and G-Point Greg come at this from a similar perspective.