^ Glad you're finding the reviews useful, Anouk.
I have not personally heard the IE8 so I cannot compare the MTP or any other IEM to them directly but I can say that I never found the MTP to be light on treble, just not aggressive/sparkly. The high-end response is definitely there and the MTP hits all of the notes, unlike the regular Turbines. It just isn't as forthcoming about it as the CK10, HJE900, H-D RE0, and some others. Personally I do prefer a more treble-heavy signature (hence my affinity of the CK10, RE0, and others) but saying that the MTP is unbalanced is a huge stretch. Hopefully someone who's heard both the IE8 and MTP can give you a more direct comparison, perhaps in one of the MTP threads.