After spent more time with Oblivion, time to switch DAC to Qutest to understand more about this amp.
(Drasitcally) character become drier, narrower staging, with thinner body overall and now fluid + effortless feel also missing.
My impression become more linear with many other's impression here, Oblivion definitely at close to neutral side, with nice bloom on midrange and bass that remain fast and far from being syrupy. Soundstage is the main point here, the imaging accuracy, and 3D depth is excellent.
Back to TT2, I thought Oblivion is kind of thick and slight on mellow side, but apparently they just amplified the TT2's sound (TT2 has the sweetest sound of Chord products).
To my system, my playlist and my preference, TT2 is easily my better choice here.
So to add my finding, I'm more than sure that Oblivion is a highly transparent amp (and I love this fact!). Good source is definitely the key to enjoy this product.