Sony Xperia Z1 vs Samsung Galaxy S4
The Xperia Z1 isn't the best phone to make calls with, and neither is the Galaxy S4. That said, they both deliver sufficient loudness and decent level of quality through their earpieces. Their microphones are also capable enough in order to transmit your voice in an easy to compehend manner, so no winner here.
Both loudspeakers are good enough for making normal conversations, though the added power of the GS4's one is a plus.
Samsung likes to stuff its smartphones with beefy batteries, but the larger size of the Xperia Z1 has allowed Sony to equip its device with an even larger unit. In this case, we're looking at a 2600 mAh battery in the Galaxy S4, and a 3000 mAh one in the Xperia Z1. Even then, the GS4 is rated to achieve a slightly better 3G talk-time of 17 hours, versus the Z1's 15 hours. In terms of stand-by, though, the Z1 should prove to last much longer, as official specs are claiming the spectacular 35 days in 3G and 31 days in 4G environment. For the S4, these numbers stand at 15 days in 3G and 13 days in 4G.
It's undeniable that the Xperia Z1 sports some technological advantages due to coming out about half a year later than the Galaxy S4. With a faster chipset and a better camera, Sony's smartphone is arguably the better device of the two here. Still, we have to give credit where it's due, and in this case we'd give it to the Galaxy S4 for holding up so well after all these months. Samsung's handset doesn't lag too much behind in any area, and is still among the best smartphones money can buy right now.
If you're currently rocking a GS4 and are wondering if you should "upgrade" to the Xperia Z1 mainly for its technological advantages, we'd say that it's not worth it, because the differences really aren't so big. If you happen to be choosing between the two, and have actually read all the pages of this comparison, then you probably already know that the Z1 is the overall better smartphone, though you should definitely take into account that it's bulkier than its rival, despite having the same screen size.