Midrange frequencies sound decent enough and benefit greatly from the improved bass control, although the clarity of the midrange does suffer a bit from the presence of the EarPods' not-controlled-enough bass. Some instruments also seem to lack body, and thanks to limited midrange detail compared to better headphones, the EarPods aren't as involving as those products. High frequencies are the standout here, with a clear, natural sound that avoids the harsh, tinny quality of the previous earbuds' treble, along with enough volume to help them stand out against the EarPods' bass.
That all may sound like faint praise, but getting good performance out of earbuds is extremely difficult. For this style of headphones, at this price, Apple's EarPods are impressive, and represent a fantastic upgrade over the previous model. In my experience reviewing headphones, I've found that good headphones enhance the listening experience, while bad ones get in the way of it. The previous Apple earbuds got in the way; the EarPods instead fit right in the center of that range--not enhancing the listening experience, but not detracting from it, either.
To better put the EarPods' performance in perspective, I directly compared them against several other earbud (not in-ear-canal) models. First, I returned to the previous version of Apple's earbuds, which confirmed my initial impressions of substantial improvement. Bass performance is clearly the older model's undoing, as it's too loud and too muddy, and it sabotages midrange and high-frequency performance. Good riddance.
I also tried out two more-expensive earbud models I had on hand for future review. The first was the $60 Urbanears Medis Plus, which features large drivers and a clever appendage that braces the earpieces against each ear's antihelix, giving them a firm fit. I immediately noticed that the Medis offered a more distinct sonic picture, with much more sonic "space" between various instruments. Midrange frequencies were much more detailed and full-bodied. The contest between the Medis and the EarPods did not result in a decisive win for the Medis, however: Although the Medis's bass volume is admirably restrained compared to that of the EarPods, because the Medis' driver is not as closely coupled to the ear canal, low- and mid-bass frequencies are much quieter than upper bass, so the Medis's sound lacks body, especially compared to the warm sound of the EarPods. The EarPods also offer high-frequency performance that's comparable to, or perhaps even better than, that of the Medis. Before the EarPods, I most frequently recommended the Medis as an alternative to Apple's earbuds, but there's now a compelling argument that the EarPods offer the better value here--although they can't match the Medis's secure fit.
Second, I compared the EarPods to the most-expensive earbuds I've used, the $199 Bang and Olufsen EarSet 3i. The EarSet offers impressive performance for earbuds--as it should at such a high price. High frequencies are crisp and detailed, and the midrange offers excellent clarity and detail. The EarSet also offers a more-secure fit thanks to its impressively engineered ear hooks, which are adjustable at three points to keep each earpiece in place. However, once again, the EarPods have an advantage in low- and mid-bass reproduction due to their closer coupling to the ear canal. Although the EarPods overdo bass, the B&O model sounds thin due to a lack of these bass frequencies. While the EarSet is impressive as a demonstration of what's possible with earbuds when price is (almost) no object, it also helps underscore the value of the EarPods.