Features Key features of the Xperia Z Ultra  vs HTC One 

screen size

System font, for whatever reason, has been moved to the 'Accessibility' menu (it's still in display settings, too), which I highly suggest turning to 'small' if your eyes are any good.
HTC One | by Android Police (Apr, 2013)

screen resolution

Xperia Z Ultra
1920 x 1080
HTC One
1920 x 1080
Impressively, further image adjustments can be made using a row of +/- 2EV sliders for exposure, contrast, colour saturation and sharpness, which is more than most handsets offer 'smartphone photographers.
HTC One | by TechRadar (Mar, 2014)

memory

processor

Xperia Z Ultra
Quad core
HTC One
Quad core
Performance is flawless on the new Snapdragon 600 quad-core chip.
HTC One | by PhoneArena (Mar, 2013)

camera resolution

HTC One
13 MP
Critics of the previous camera might be disappointed to find that this is the same UltraPixel sensor setup: it's still a 4-megapixel resolution and one of the side-effects of that is that the HTC One (M8) doesn't offer much scope to crop or digitally zoom like the Nokia Lumia 1020.
HTC One | by PocketLint (Apr, 2014)

Differences What are the advantages of each

Back view of Sony Xperia Z Ultra

Reasons to consider the
Sony Xperia Z Ultra

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Acts as a wi-fi hotspot Yes vs No Somewhat common; Share your cellphone's data plan with other devices
Supports FM radio Yes vs No Somewhat common; Listen to music and news from local radio stations
Noticeably bigger screen 6.4" vs 5" Around 30% bigger screen
Much better theoretical download speed 150 Mb/s vs 42.2 Mb/s More than 3.5x better theoretical download speed; enjoy lightning fast downloads on modern networks
More battery capacity 3,050 mA·h vs 2,600 mA·h More than 15% more battery capacity
Quite a bit thinner 6.5 mm vs 9.9 mm Around 35% thinner
Longer standby time (3G) 49,248 min vs 30,240 min Around 65% longer standby time (3G)
View of HTC One

Reasons to consider the
HTC One

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Much lighter 145 g vs 212 g More than 30% lighter
Significantly longer talk time (3G) 1,608 min vs 960 min Around 70% longer talk time (3G); go days without charging
Significantly higher resolution front camera 13 MP vs 8 MP Around 65% higher resolution front camera; Video chat with other people
Sharper screen 440 ppi vs 344 ppi Around 30% sharper PPI; enjoy photo-realistic, crisp images

Reviews Word on the street

Xperia Z Ultra  vs HTC One 

8.0
9.0
The camera has a fast f/2.0 lens, a backside illuminated sensor (BSI), HDR for photo and video recording, panorama sweep and a plethora of shooting features.
HTC One

8.7
8.5
The Z Ultra towers above all those phablets not only in screen size, but in specs and design, too, so if you've thrown out ergonomics and pocketability with the decision to get one anyway, you might as well do the full song and dance.
Xperia Z Ultra

8.0
10.0
The LCD display comes protected by Corning Gorilla Glass 3 and offers great viewing angles.
HTC One

8.0
9.5
Our daylight images would benefit from a tad more brightness and contrast for example, as would our interior still life shot likewise benefit from an application of the HTC's built-in filter in the Google Play version.
HTC One

Overall

8.1 Out of 10
9.0 Out of 10

Specifications Full list of technical specs

screen

Xperia Z Ultra  vs
HTC One 
Size 6.4" 5"
Resolution 1920 x 1080 1920 x 1080
Multitouch Yes N/A
PPI 344 ppi 440 ppi

hardware

Clock speed 2.2 GHz 2.3 GHz
Number of cores Quad core Quad core
RAM 2 GB 2 GB
Internal storage 16 GB 16 GB
Supported card formats
SDXC
SDHC
SD

photo & video

Camera 8 MP 13 MP
Resolution 8 MP 13 MP
Secondary camera 2 MP 5 MP
Video resolution 1920 x 1080 @ Unknown 1920 x 1080 @ Unknown

cellular

Generation 4G 4G
Networks
LTE (20 Mb/s)
GPRS (0.01 Mb/s)
HSUPA (5.76 Mb/s)
UMTS (0.38 Mb/s)
LTE Cat4 (150 Mb/s)
LTE Cat 4 (150/)
EDGE (0.38 Mb/s)
LTE Cat3
HSDPA+ (42.2 Mb/s)
GSM (0.01 Mb/s)

battery

Talk time (3G) 960 min 1,608 min
Standby time (3G) 49,248 min 30,240 min
Capacity 3,050 mA·h 2,600 mA·h

form factor

Xperia Z Ultra  vs
HTC One 
Weight 212 g 145 g
Thickness 6.5 mm 9.9 mm
Size 92.2 x 179.4 x 6.5 mm 70.7 x 146.4 x 9.9 mm

sensors

Has an assisted GPS Yes Yes

music

Supports FM radio Yes No

software

Operating system Android 4.4 Android 4.4.2
Multitasking Yes Yes
App store Android Market Android Market
Adobe flash support No No
App store size 850,000 apps 850,000 apps

connectivity

Acts as a wi-fi hotspot Yes No
Supports NFC Yes Yes
Bluetooth Bluetooth v4.0 Bluetooth v4.0
Sony Xperia Z Ultra
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HTC One
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