Predicting the evolution of physical systems governed by PDEs from sparse, irregular observations remains a major challenge. While most data-driven methods focus on dense, grid-structured data, real-world applications often involve limited, noisy measurements. We extend the DynaBench benchmark to evaluate fourteen modern models—including neural operators and graph-based methods—across multiple PDEs, spatial resolutions, and observation patterns. Our study reveals how sparsity and spatial structure affect model performance in low-data regimes. All code and resources are publicly released to support reproducibility and future work.