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Sony also promises that the Android 4.3 update is "right around the corner" for the rest of its Xperia lineup.
A limited-time promotion sees Sony giving away hundreds of dollars worth of movies, music, and apps for the Xperia Z1, Z1S, and Z2.
At IFA, the company announces its waterproof 5-inch Android phone with a high-end image sensor, software to take advantage of it, and unusual QX10 and QX100 add-ons that turn it into a compact camera.
As with the original flagship, Samsung is counting on the midrange phone's fingerprint scanner, heart-rate monitor, and extra apps to stand out.
Pricing not available
At CES in Las Vegas, Sony's Kunimasa Suzuki shows off the company's latest Xperia smartphone, which features a new 20.7MP camera
The Xperia Z1F is a sawed-off version of Sony's waterproof flagship Android smartphone, with a 4.3-inch screen instead of a 5-incher.
The Sony Xperia Z1 gets that shrinking feeling with a new, smaller version officially announced in Japan.
Does the Sony Xperia Z1 have what it takes to be the king of smartphone cameras? We put it to the test in our camera review.
The company says that the devices will run KitKat as standard and include some updates to native apps.