That's why we gave you the opportunity to ask any questions that might still be lingering inside your heads in a Q&A post following the review. The time has now come for us to take a look at what bothers you and attempt to make things as clear as possible. Let's see if we can help...
Answer: It's safe to say that the Xperia Z2 matches the Galaxy S5 in terms of camera speed. We've measured that the S5 is ever so slightly faster to take a picture (2.5 sec for S5 vs 3 sec for Z2), but overall, the Z2 shouldn't feel slower. Furthermore, the synthetic benchmark application, Camspeed, returns a better result for the Z2 (452 score for Z2 vs 300 score for S5), so yeah, it should be able to at least match it.
Answer: We believe this question isn't really so simple to answer, which is why you'd be better off if you go and check out our in-depth comparison featuring the Xperia Z2 and Xperia Z1! Getting to know the exact differences between the two will allow you to make a better decision.
Answer: The battery life with the Xperia Z2 should be even better than that of the G2, as suggested by our custom battery life test. In it, the Xperia Z2 has managed to last for the impressive 8h 10 min, while the LG G2 achieved the still-good, but not-quite-there 6h 48 min. That doesn't necessarily mean that the Z2 will last you longer than the G2, because that depends on a number of factors, but in general, yes, we expect Sony's flagship to exhibit better battery life.
Answer: There isn't such a great difference between the sound quality of the M8's pair of earphones and the one available with the Z2. Both sound quite good, with that of the One (M8) being a bit more punchy, with slightly less mid frequencies. The earphones of the Xperia Z2 sound slightly fuller and flatter. You won't go wrong with either one.
Answer: The screen of the Xperia Z2 is more on the warmer side, considering the competition. The average screen temperature is about 6900 K, which means the Z2 will appear warmer than most high-end LCD screens currently on the market.
Answer: Nope, you can't control shutter speed.
Answer: Sadly, no. The Xperia Z2 cannot record 1080p video at 60 fps out of the box. You can record 720p video at 120 fps though.