Here's a closer look at this majestic battleship.
It's 152 meters in length and 27,3 m wide, with a draught of 8,8 m. Displacement was 20023 tons (21595 tons max). Armor on the side was 280 mm, on the deck 48 mm, at the fire control centers 356 mm, and on the turrets 305 mm. Range: 7778,4 km (4200 nautical miles). It was manned by 1087 crewmembers.
The main pint of interest is the main guns and the turrets the were placed in. The usual build was 5 turrets with 2 main guns each. But turrets were heavy as fuck due to all the armor, so after some considerations they reduced the number of turrets to 4 and with the gained weight they replaced with guns. So they put three of the 305 mm guns into one turret, so they gained more overall firepower with 12 main guns.
The ship also had twelve 150 mm secondary guns, and another 20 auxiliary guns in 70 mm caliber. They rounded this with 47 mm AA guns, and torpedo launchers.
The Saint Stephen differed in some of the designs and even in the turbines and boilers. One curiosity is that it had only 2 propellers, for the older Tegetthoffs needed 4 since they had double the turbines to move forward and back, but the stronger ones on the S.S. solved this issue.

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#1 Designs
#2 Comparison of the Saint Stephen's sister ship, the Viribus Unitis, with the Dreadnought
#3 Saint Stephen rear view