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Hey,
 

There's a good thread about the AKG K 14 (and 314) here: http://www.head-fi.org/forum/thread/209261/akg-k14p-portable-earphone-review. However, I didn't want to necro it because it's actually in the full-sized headphone section.

 

Someone in that thread said the K 14/314 do well against the Yuin PK line while another person said they didn't. I was wondering if now, two years later, there might be more opinions about these AKG buds vs. the Yuin PK line?

 

The K 14/314 have been my favorite earbuds for five years, but lately I've also been thinking about getting the PK3 or PK2.

 

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As a way of bump, I've also been looking at the Sunrise Charms recently. However, people are describing them as warm, which – if it's the Sennheiser kind of warm – is probably not what I'm into.
 
I'm perfectly happy with the K 314, in fact I recently bought three more pairs in case they're getting discontinued, but if there's better sound to be had for a reasonable price then I might as well try it out.

 

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I'm now in the fortunate position to answer my own question, at least regarding PK3 vs K 314. I bought the PK3 last winter and got around to comparing them to the K 314 lately.
 
In short, the PK3 isn't an upgrade over the K 314 unless all you want is more bass.
 
Having done some comparisons... The PK3 have a deeper soundstage, but the K 314 have more width. The PK3 have better bass, but the K 314 have better highs. The K 314 fetch more detail and sound more coherent.
 
The K 314 signature is like an earbud version of the K 240 DF, give or take. The PK3 are ok.
 
The Blox M2C are like a better version of the K 314, but cost more.
 
For the past year or so the K 314 were sold locally for 6 €, which was one of the best bargains in earbud history. They're typically priced about the same as the PK3, though AKG has apparently now discontinued them. The replacement, K 315, is a lot of steps backwards.