1. Comparing Sony Alpha A7 Mark II and Sony Alpha A7R
1.1 Physical Specifications
Comparing Sony A7R and A7II in terms of technical specifications reveals that both versions are interchangeable lens cameras with full-frame sensor capability. The size of A7 II and its predecessor doesn't differ significantly. The youthful, compact design is a considerable advantage for camera enthusiasts. However, the weight of Sony 7R is only 465g, lighter than the Sony A7 II.

1.2 Sensor Comparison
The sensor is often referred to as the heart of the camera. With a 36.2MP image sensor, A7R boasts higher resolution compared to A7 II, which stops at 24MP. Both cameras feature full-frame sensors although with slightly different sizes; the sensor area of A7R is approximately 1% larger. However, as A7 II is a more recent model than A7R, its sensor has been upgraded with new technologies enhancing autofocus capabilities to produce the most authentic images.
1.3 Regarding Features
In addition to design and sensor, A7 II has seen significant improvements over its predecessor. The first similarity is that both cameras feature electronic viewfinders, which are very useful when shooting in harsh sunlight. Furthermore, they both use an OLED viewfinder with 2400K resolution, delivering sharp, high-quality images.
Another differentiating feature between A7II and Sony Alpha A7R is image stabilization. A7II is equipped with a 5-axis stabilization system that works on both the lens and the camera body, and can be adjusted to suit any shooting scenario.
Therefore, you can rest assured about image quality, ensuring sharp, blur-free images in every situation. In summary, Sony A7 II has been praised by many tech enthusiasts for being able to rival professional-grade DSLR cameras with ultra-real image quality.
1.4 Connectivity Capabilities
When comparing Sony A7R and A7II in terms of connectivity, it's evident that Sony Alpha A7 Mark II offers more enhancements. Its swift and effortless multimedia connectivity is a strong point, making it one of the highly acclaimed professional camera series. The super-fast Wi-Fi connection allows easy photo sharing with smartphones or quick updates on social media or email. Moreover, the camera also supports sensitive touch connection, offering an enjoyable and convenient experience.
1.5 Regarding Price
The official price of Sony Alpha A7 Mark II is 23,400,000 Vietnamese Dong. Sony Alpha A7R, having been on the market for quite some time, is still available on various e-commerce platforms, with prices ranging from 14 to 19 million Vietnamese Dong. Overall, there is a considerable price difference between the two versions. Therefore, careful consideration of one's usage needs before making a purchase is essential.

2. Choosing Between Alpha A7 Mark II and Sony Alpha A7R
Apart from slightly subdued autofocus and some lens limitations, Sony A7R is an impressively cost-effective camera model. Its sleek design and numerous modern features deliver excellent image quality. Additionally, one of the strengths of Sony A7 when comparing Sony A7R and A7II is that it often undergoes significant price reductions as it has been on the market for a long time.

Sony A7 II undoubtedly offers more modern features than its 'big brother' A7R launched a year earlier. The camera can capture images at a higher frequency and has significantly improved video autofocus. However, there is also a considerable price difference between these two professional Sony cameras. Depending on one's needs and economic conditions, it's important to carefully choose a suitable camera to avoid waste.