Those in the market for a decent 4K resolution display at a reasonable price may be interested in Dell's latest offerings. The 23.8-inch P2415Q and the 27-inch P2715Q are both of the desirable IPS panel type but check in at TN display prices of $599.99 and $699.99, respectively.
As The Tech Report correctly points out, the two displays are nearly identical aside from screen resolution. Both are said to be factory calibrated with wide color coverage at 99% sRGB and delta-E of less than three. Color support for the pair is listed at 1.07 billion although the publication believes we're probably looking at 8-bit panels augmented by dithering instead of true 10-bit tech.
Elsewhere, the displays can output full resolution at 60Hz (up from 30Hz in earlier Dell models). They also both have 178-degree viewing angles, 1000:1 contrast ratio and 6ms "fast" response times. Specifically, the P2415Q features a 300-cd/m² brightness rating and an 8ms "typical" response time. The P2715Q, meanwhile, is rated for 350 cd/m² and 9 ms "typical" response time.
Connectivity-wise, you're looking at a four-to-one USB 3.0 hub, an MHL-compatible HDMI port, a DisplayPort connection, mini DisplayPort and a DisplayPort output that allows daisy-chaining of a second screen.
Both displays are pretty versatile as their mounts can be adjusted for landscape or portrait views. You can even remove the mount completely and swap in a VESA-compatible mount to hang it on the wall or attach to a custom display arm.