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People must notice that “He said he never was able to see so many details in the shadows”.
It is merely the DR in the “shadows”, and is not “the highlight range”.

I had ever listed some data like below, though it relating Nikon, but is also the same cases as the Sony camera.
In the same period the same sensor technology it is a slightly larger pixel pitch certain to be easily doing better.

Nikon d5100, ISO 84 measured, (4.8μm sensor)
SNR 0dB, Gray Scale 0.012%, SNR 44.5dB, Gray Scale 100%,
Nikon d5200, ISO 69 measured, (3.89μm sensor)
SNR 0dB, Gray Scale 0.012%, SNR 41.9dB, Gray Scale 100%,
Nikon d3200, ISO 71 measured, (3.85μm sensor)
SNR 0dB, Gray Scale 0.018%, SNR 42.2dB, Gray Scale 100%,

Olympus OM-D E-M5, ISO 107 measured, (3.7μm sensor)
SNR 0dB, Gray Scale 0.028%, SNR 42.2dB, Gray Scale 100%,

Nikon d4, ISO 75 measured, (7.2μm sensor)
SNR 0dB, Gray Scale 0.016%, SNR 47.4dB, Gray Scale 100%,
Nikon d600, ISO 79 measured, (6.0μm sensor)
SNR 0dB, Gray Scale 0.010%, SNR 46.0dB, Gray Scale 100%,
Nikon d800, ISO 74 measured, (4.8μm sensor)
SNR 0dB, Gray Scale 0.010%, SNR 43.3dB, Gray Scale 100%,

Nikon d4 is the best highlight range SNR. Nikon d600 has a very excellent sensor.
the d5100 has a quite well APS-c sensor, the highlight area have higher SNR, not only for shadow area.

Not only in the highlight range SNR the d5100 is better than the d5200, so that the d5100 highlight range DR is also better than the d5200.
People should not blind worship the DxOmark Overall scores and the 8MP print mode, it is DxO Heroin.

You ought to carefully observe the pixel-level imaging quality.
Maybe you seen DxO DR is even ‘higher’ under the 8MP print mode, in fact it is fake.
In fact the highlight range the DR is impossibility to get “optimized” from the “8MP print mode”. The 8MP print mode DR is artificial to the shadow area’s visual noise get changed, that is equivalent to post-process, sounds like DxO DR higher, actually is fake, (non directly measured value).
Actually the highlight range there once the overexposure is impossibility to get “normalization” from the “8MP print mode”.
DxOmark Overall scores and the 8MP print mode are pseudoscience juggling.

Also, people ought to carefully observe the imaging quality of the Border and Corners relating the Camera Sensor.
you can observe through from Photozone and get a comparison of the pixel pitch and the imaging quality of the Border and Corners. It is very important, but DxOmark would never tell you.

For examples, The imaging quality of the Border and Corners

one lens, Nikkor 12-24mm f4G DX
mounted on the d200 (6.0μm 10MP sensor)
MTF50 LW/PH, @f4.0, (12mm)
Center ———– 2181.5
Extreme ——— 1501
CAs ————— 1.62 (max) pix
Extreme/Center = 69%

mounted on the d7000 (4.8μm 16MP sensor)
MTF50 LW/PH, @f4.0, (12mm)
Center ———– 2718
Extreme ——— 1591
Cas —————- 2.06, (2.24@16mm f5.6) pix
Extreme/Center = 59%

Note, the 4.8μm 16MP DX sensor is not very bad imaging in Corners, in tolerable, despite it is somewhat worsened. However, the 3.8μm 24MP DX sensor is worse visible.

One lens, Planar T 85mm f1.4 ZA,
mounted on the 5.5μm 12MP APS-c sensor,
MTF50 LW/PH, @f1.4,
Center ———– 2091.5
Border ———– 2006.5
CAs ————— 0.54 (pix)
Border/Center = 96%

mounted on the 3.85μm 24MP APS-c sensor,
MTF50 LW/PH, @f1.4,
Center ———– 2783
Border ———– 2084
CAs ————— 0.90 (pix)
Border/Center = 75% (that is worse visible)

Note, if a large aperture wide-angle lens mounted on the 3.85μm 24MP sensor will get worse.

a smaller pixel pitch always has even harder of the imaging quality of the Border and Corners, it could only turn into worse but not better. The sensor micro-lenses will be continued at next 5 years or longer.
(you can observe Photozone and get a comparison of the pixel pitch and the imaging quality of the Border and Corners).